09 dodge journey p0152

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P0152 – Meaning, Causes, Symptoms, & Fixes

Home > OBD2 Codes P0152 – Meaning, Causes, Symptoms, & Fixes

Jeffrey N. Ross

• March 23, 2022

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What Does Code P0152 Mean?

• P0152 definition : Bank 2 Sensor 1 oxygen sensor has an abnormally high voltage reading
• Issue Severity: MODERATE– Extended driving with this code can cause internal engine damage.
• Repair Urgency: Get this code fixed as soon as possible.
• Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0152 code. This DTC can be triggered by a faulty oxygen sensor and/or wiring or issues with the fuel/air system.

Code P0152 is triggered when the Engine Control Module (ECM) detects an abnormally high voltage (approximately 1.2V or higher) on the signal circuit of the bank 2 sensor 1 Oxygen (O2) Sensor for an extended period of time. Bank 1 is the bank with cylinder 1, bank 2 is the opposite bank. Sensor 1 is the oxygen sensor before the catalytic converter in reference to exhaust flow. This high voltage reading can be caused by a short to power on the signal circuit, the engine actually running rich, or a faulty O2 sensor.

P0152 Causes

• Bank 2 Sensor 1 O2 Sensor (most common)
• Vehicle running rich (possible codes P0172  and/or  P0175 )
• Frayed, damaged, or shorted wiring
• Faulty connector(s)
• Stuck open or leaking fuel injector
• Faulty fuel pressure regulator

P0152 Symptoms

• Check Engine Light
• Poor fuel economy
• Higher emissions
• Poorly running engine

* No noticeable adverse conditions in some cases

How Do I Fix Code P0152?

With a P0152 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction in the downstream oxygen sensor system. Using the live data function of the FIXD sensor and app allows you to read and analyze engine data to properly diagnose a P0152 code.

If the sensors are all reading correctly and you’re not comfortable further diagnosing this issue at home, we recommend finding a  RepairPal-certified shop  to pinpoint the problem and give an accurate estimate for repairs.

These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing.

> Find a RepairPal Certified Shop Near You

How Much Does It Cost to Fix Code P0152?

If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0152 code.

Possible Repair Costs for P0152

When it comes to making repairs associated with the P0152 code, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair.

• Oxygen sensor: $200-$300
• Catalytic converter: $400-$2400
• A leak in exhaust: $100-$200 (if welded to repair)

DIY Steps to Diagnose Code P0152

If you’d like to try to fix code P0152 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Complete diagnosis may require some specialized equipment beyond what the FIXD Sensor can provide, but the biggest challenge for this repair is that internal engine issues could be the root cause of this code. As such, this diagnosis and repair should not be attempted by beginner DIYers.

DIY difficulty level: Beginner

This repair can be attempted by beginner DIYers.

Tools/parts needed (our top picks from Amazon):

• Basic Hand Tools
• Vehicle Specific Service Manual

STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT.

Scan your vehicle to verify P0152 is the only code present. If other codes are present, they must be addressed first.

STEP 2: INSPECT O2 SENSORS AND WIRING.

Visually check the electrical connections, wire harness, and metal tabs in terminals for any damages. If any damage is found, replace the oxygen sensor.

STEP 3: CHECK FREEZE FRAME DATA.

Check the freeze frame data in order to pinpoint the issue.

STEP 4: CHECK OXYGEN SENSOR(S) WITH MULTIMETER.

Using your multimeter, check for varying voltage of between .1-.95V on the signal wire of the bank 2 sensor 1 O2 sensor with the engine running at operating temperature. If this reading is consistently high, unplug the O2 sensor and see if the voltage changes. If it stays the same, you have a short in the wiring harness and it will need to be repaired. If it drops, the circuit is fine and you either have a rich running concern or a faulty O2 sensor. Consider replacing the bank 2 sensor 1 O2 sensor at this point.

STEP 5: CHECK THE ENGINE GROUND.

If after replacing the oxygen sensor the code repopulates, you may have an issue with the vehicle actually running rich. Consider checking fuel pressure; if this is normal, it may be time to take it to a shop that has a diagnostic scan tool capable of performing fuel trim tests.

STEP 6: CONSULT A PROFESSIONAL.

If at this point the vehicle is still setting the same code, you may have a more serious problem with your car’s oxygen sensor system, and you should bring the vehicle to a certified shop to have further diagnostic work performed.

Common P0152 Diagnosis Mistakes

Replacing the O2 sensor without checking for a wiring concern.

Still Need Help Fixing Code P0152?

If you’ve followed the steps above and are still experiencing issues with the catalyst system and code P0152, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you to get the right repairs at a fair price.

Popular Engine Codes po420 code po172 code po0171 code po128 code po300 code po456 code po430 code po442 code po455 code po113 code

Fixed It But The Check Engine Light Is Still On?

Check engine light sometimes need to be reset manually, check out our article:

How to Reset Your Check Engine Light | 4 Ways To Clear It (With or Without a Scanner)

Lifelong automotive enthusiast with a soft spot for offroading. Wrencher turned writer, but I still love to tinker on just about anything with an engine. Dream car: tie between a ‘71 Hemi ‘Cuda and a ’91 GMC Syclone. #GirlDad #SaveTheManuals

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Dodge DTC P0152

• O2 SENSOR 2/1 SIGNAL CIRCUIT SHORTED TO VOLTAGE
• O2 SENSOR 2/1 RETURN CIRCUIT SHORTED TO VOLTAGE
• O2 SENSOR 2/1 SIGNAL CIRCUIT OPEN/HIGH RESISTANCE
• O2 SENSOR 2/1 RETURN CIRCUIT OPEN/HIGH RESISTANCE
• O2 SENSOR 2/1
• POWERTRAIN CONTROL MODULE (PCM)

Home » Troubleshooting » Dodge Journey bad O2 sensor symptoms, causes, and diagnosis

Dodge Journey bad O2 sensor symptoms, causes, and diagnosis

The O2 sensor in Dodge Journey monitors the level of oxygen in the engine’s exhaust gases and reports the data to the control unit that continuously adjusts the air to fuel ratio in the engine to achieve maximum efficiency. Driving your Journey with a bad oxygen sensor can damage the engine or the catalytic converter, so you must act urgently to avoid more expensive repairs.

The most common signs of bad O2 sensor in Dodge Journey are slow acceleration, loss of power, irregular idling, engine hesitation or jerking when accelerating, high fuel consumption, higher tailpipe emissions, foul odor from exhaust, check engine light illuminates, and sometimes stalling.

Upstream and downstream O2 sensors

Upstream o2 sensors are important for engine performance.

There are multiple O2 sensors in Dodge Journey, how many depends on vehicle configuration and model year. But the most important one is the upstream O2 sensor, the one that is closest to the engine, usually in the exhaust manifold. The upstream O2 sensor helps in maintaining proper air to fuel ratio in the combustion chambers for maximum fuel efficiency and engine performance. Any fault in this sensor can cause all sorts of performance issues in your Journey.

Downstream O2 sensors do not affect engine performance

The downstream O2 sensor in Journey is located further down the exhaust system, after the catalytic converter, and is responsible for measuring the level of pollutants passing through the catalytic converter. The main purpose of downstream O2 sensor is to ensure that the catalytic converter is functioning properly. If this sensor goes bad, it does not have any affect on the engine performance, but the check engine light may illuminate and you may see error codes related to catalyst efficiency.

Bad O2 sensors lead to catalytic converter failure

Faulty oxygen sensors are the leading cause of premature catalytic converter failures. If you suspect a problem with O2 sensor in your Journey, you should act immediately and get it checked by a professional mechanic. Because O2 sensors are relatively cheap compared to the price of catalytic converters, which can easily cost you over a thousand dollars to replace.

How to check for bad O2 sensor in Journey?

If there is any fault in the oxygen sensor, it usually illuminates the engine check light in the instrument cluster of Dodge Journey. You can diagnose the problem by connecting an OBD2 scanner to your vehicle. If you see any error code from P0130 to P0135 or from P0150 to P0155, it indicates a problem with the upstream oxygen sensor. You can also perform a continuity test on the connector of the sensor with a multimeter to check if the heater circuit is broken.

How to replace O2 sensor in Journey?

You don’t necessarily have to visit a workshop to replace oxygen sensor in your Dodge Journey. All you need is a wrench for this replacement job. Make sure the engine is cold before replacing the sensor to prevent burn injury.

• Locate the O2 sensor to be changed.
• Unplug the connector of the sensor.
• Unscrew the O2 sensor with a wrench.
• Apply anti-seize lubricant to the threads of the new sensor.
• Screw in the new O2 sensor by hand and tighten it up with a wrench.
• Connect the electrical plug of the new sensor.

Recommended video

What causes O2 sensors to fail in Dodge Journey?

All O2 sensors fail over time since it is a wearing part. There is no fixed time limit for when they fail, but they typically last over 100,000 miles in Journey. However, they can fail much sooner due to contamination. For example, due to silicates entering the exhaust system after coolant burns in the engine due to a leaky head gasket, or phosphorus from excessive oil consumption due to worn piston rings or valve seals.

What happens if you keep driving with a bad O2 sensor?

Driving your Dodge Journey with a bad O2 sensor can cause sluggish and rough acceleration, along with high fuel consumption and emissions. And if you continue driving for several months, it may lead to engine damage or catalytic converter failure which can cost thousands of dollars to fix or replace.

Can a bad O2 sensor cause poor acceleration?

If the oxygen sensor goes bad in Journey, it does not send correct measured values ​​to the engine control unit. The optimal amount of fuel can no longer be calculated which results in either too little or too much fuel injected into the combustion chambers. The engine runs too “lean” or too “rich”. Since a rich or lean condition robs a vehicle of power, a bad oxygen sensor can cause poor acceleration.

Can a bad O2 sensor cause shaking?

A faulty O2 sensor can certainly cause shaking or vibrations in Dodge Journey when driving. When the O2 sensor goes bad, it causes improper air-to-fuel mixture in the combustion chambers which can cause the engine to shake, these vibrations can be felt in the cabin of the vehicle when driving.

Will a new O2 sensor improve gas mileage?

According to EPA, replacing a bad oxygen sensor can improve fuel economy by as much as 40 percent. So if your Journey develops a greater thirst for gas, you should definitely consider checking or replacing O2 sensor, especially if the vehicle has racked up more than 100,000 miles.

Use OBD2 scanner for diagnosis

Since Dodge Journey is equipped with on-board diagnostics (OBD), a fault diagnosis can provide initial indications of where the malfunction is located.

To begin troubleshooting, you must first connect the diagnostic tool to your Journey. The OBDII connector is usually located under the dashboard. With the tool connected, turn on the ignition. Most diagnostic devices then ask for some information about the vehicle. It is important that you enter this 100% correctly, otherwise the result of the search may be inaccurate. In addition to the vehicle make, model, and engine type, you usually also have to type in the Vehicle Identification Number (VIN). Since some OBD codes are manufacturer-specific, the scanner will be able to give you more accurate information if you enter more details about your Journey.

Diagnostic error codes for O2 sensors

Following are all the error codes that indicate a problem with an oxygen sensor.

• P0130 = 02 Sensor Circuit Malfunction (Bank 1 Sensor 1)
• P0131 = 02 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
• P0132 = 02 Sensor Circuit High Voltage (Bank 1 Sensor 1)
• P0133 = 02 Sensor Circuit Slow Response (Bank 1 Sensor 1)
• P0134 = 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
• P0135 = 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
• P0136 = 02 Sensor Circuit Malfunction (Bank 1 Sensor 2)
• P0137 = 02 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
• P0138 = 02 Sensor Circuit High Voltage (Bank 1 Sensor 2)
• P0139 = 02 Sensor Circuit Slow Response (Bank 1 Sensor 2)
• P0140 = 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
• P0141 = 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
• P0142 = 02 Sensor Circuit Malfunction (Bank 1 Sensor 3)
• P0143 = 02 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
• P0144 = 02 Sensor Circuit High Voltage (Bank 1 Sensor 3)
• P0145 = 02 Sensor Circuit Slow Response (Bank 1 Sensor 3)
• P0146 = 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
• P0147 = 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
• P0150 = 02 Sensor Circuit Malfunction (Bank 2 Sensor 1)
• P0151 = 02 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
• P0152 = 02 Sensor Circuit High Voltage (Bank 2 Sensor 1)
• P0153 = 02 Sensor Circuit Slow Response (Bank 2 Sensor 1)
• P0154 = 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
• P0155 = 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
• P0156 = 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
• P0157 = 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
• P0158 = 02 Sensor Circuit High Voltage (Bank 2 Sensor 2)
• P0159 = 02 Sensor Circuit Slow Response (Bank 2 Sensor 2)
• P0160 = 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
• P0161 = 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
• P0162 = 02 Sensor Circuit Malfunction (Bank 2 Sensor 3)
• P0163 = 02 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
• P0164 = 02 Sensor Circuit High Voltage (Bank 2 Sensor 3)
• P0165 = 02 Sensor Circuit Slow Response (Bank 2 Sensor 3)
• P0166 = 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
• P0167 = 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3)

If you see noticeable loss of performance or engine hesitation in your Dodge Journey with high fuel consumption, a defective upstream oxygen sensor should definitely be considered. Even if your vehicle is not showing any signs of trouble, it is recommended to replace the upstream O2 sensor after 100,000 miles for optimal engine performance and fuel efficiency.

In any case, it is advisable for laypersons to visit a workshop. A professional mechanic can swiftly diagnose the problem for you.

What one is bank 1 02 sensor on a 2010 Dodge Journey 2.4L

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• Complete List of OBD2...
• P0152 – What Does...

P0152 – What Does It Mean and How To Fix It

This is one of the most frequent  OBD2 trouble codes . Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

P0152 is an OBD-II Code that refers to Sensor Circuit High Voltage (Bank 2 Sensor 1)

A P0152 code is a generic diagnostic trouble code that occurs when the PCM/ ECM detects a signal voltage input indicating that the sensor is above normal range. The O2 (oxygen) sensors analyze the exhaust’s oxygen content and then the powertrain control module adjusts fuel injector pulse based on this information. They can cause the PCM to add or subtract too much gas based on the faulty O2 sensor voltage.

When this occurs, the vehicle’s computer will set off the check engine light and set a Diagnostic Trouble Code P0152.

Common causes for this code include:

• Bank 2 Sensor 1 O2 Sensor (most common)
• Running too rich with fuel.
• Wiring that has frayed, broken, or been shortened
• Damaged or corroded connector(s)
• A stuck or leaking fuel injector
• Pressure regulator is faulty.

The symptoms of a P0152 code are:

• Illuminated Check Engine Light  
• Reduced fuel economy
• Increased emissions
• Engine poor performance

To diagnose a P0152  DTC code, a technician would:

• Scan for codes in the ECM and look at the freeze frame data for failure.
• Visually inspect the wiring, connectors, and O2 sensor itself.
• Check fuel pressure (if low it will throw off the oxygen sensor readings)
• Use a multimeter to check for voltage or resistance at the O2 connector (if no voltage/resistance is found then there may be an open in the wiring)
• Test for any exhaust leaks prior to the O2 sensor
• If all else fails, replace the Bank 2 Sensor 1 O2 sensor .

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a P0152 code:

• Not thoroughly inspecting all the wiring and connectors.
• Not checking for other codes that may be stored along with the P0152 code.
• Not checking fuel pressure to make sure it is within specification.
• Not testing for exhaust leaks before replacing the O2 sensor .

How serious is this?

A P0152 code is a mid-high code in severity since it can cause the vehicle to run too rich and produce increased emissions. It can also cause engine performance issues.

What repairs can fix the code?

The following are solutions that may fix this problem:

• Repair or replace any faulty parts such as wiring, connectors, or hoses.
• Clean or replace the O2 sensor .
• Check the fuel pressure and adjust if necessary.
• Repair any exhaust leaks before the O2 sensor .
• Replace the Bank 2 Sensor 1 O2 sensor .

Related codes

A P0152 is related to and may be accompanied by the following codes:

P0132 – Bank 1 Sensor 1 O2 Sensor (Sensor Circuit High Voltage)

P0133 – Bank 1 Sensor 1 O2 Sensor (Slow Response to Rich-Lean Cycle Change)

P0138 – Bank 2 Sensor 2 O2 Sensor (High Voltage)

In conclusion, the P0152 code is a diagnostic trouble code that refers to a problem with the oxygen sensor circuit on Bank 2 Sensor 1. This can often be caused by a faulty O2 sensor , wiring issue, or fuel pressure problem. A technician should use a multimeter to check for voltage/resistance at the O2 connector and also check for any exhaust leaks before replacing the O2 sensor .

• P0152 oxygen sensor

Fix code P0152 oxygen sensor

Oxygen Sensor

Speaking of oxygen sensors, you’d better get used to the new technology. The new sensors are called Wideband Oxygen Sensors, Wide Range Air Fuel (WRAF) sensors, or Air/Fuel Sensors (A/F). We’re not just talking semantics here. There really is a difference in how these sensors work.

Old style sensors generate their own voltage Old style oxygen sensors are literally voltage generators. In other words, they generate their own voltage based on the difference between oxygen content in the exhaust stream and oxygen content in the atmosphere. The voltage ranges from 0.1 to 0.95-volt, with the midway point of 0.45-volts acting as the crossover point. If the sensor reports a voltage below 0.45-volts, the PCM interprets that as lean exhaust, anything over 0.45-volts as rich. However, no computer can accurately calculate the correct amount of fuel as the vehicle is moving—there are just too many variables. You’re always moving the gas pedal, the vehicle is going up and down hills and so the fuel needs are always changing. Since the oxygen sensor is located in the exhaust stream, it’s always measuring how well the PCM did calculating air/fuel mixtures. But it’s always after the fact. By constantly varying the fuel injector ON versus OFF times and watching the oxygen sensor cross-counts, the PCM narrows the “window of errors” to achieve an emissions-friendly reading. And, the PCM “learns” from these calculations and adjusts short and long term fuel trims based on that learning process.

Wideband Oxygen Sensors Work Differently Wideband Sensors are different because they don’t generate their own voltage. They receive input voltage from the PCM. The reference voltage varies depending on car manufacturer (3.3-volts for Toyota A/F sensors and 2.6-volts on Bosch and GM Wideband Sensors are just two examples). Wideband Sensors still see the swing between rich and lean, but they don’t report it to the PCM as cross-counts. Instead, the internal circuitry varies the output voltage to the PCM.

Both have heaters In order for the sensing elements to respond to oxygen levels, they must get hot. So the sensors include a built in heater coil. Both traditional and Wideband Sensors have a heating circuit. And just like the older styles, the new Wideband Sensors can develop short-to-ground conditions and failed heaters.

Contamination and leaks Just like old style sensors, Wideband Sensors can also be contaminated by phosphorous from motor oil, coolant, sulfur, and silicone. And, they’re just as easily fooled by exhaust leaks that allow atmospheric air to enter the exhaust stream. When a wideband O2 sensor or A/F sensor fails, the symptoms appear almost the same as a conventional oxygen sensor: The engine may run rich, get poor fuel economy and generate higher than normal levels of carbon monoxide (CO) in the exhaust.

And the causes of the problem may be the same as well–bad wiring connections or a faulty heater circuit relay or a wiring fault, leaky exhaust manifold gasket or leaky exhaust valves.

Most pros check sensor operation with a scan tool. But there are some checks you can perform with a digital voltmeter. For example, you can connect a DVOM multimeter in series with the sensor’s voltage reference line (refer to a wiring diagram for the proper connection). Connect the black negative lead to the sensor end of the reference wire, and the red positive lead to the PCM end of the wire. The meter should then show an increase in voltage (above the reference voltage) if the air/fuel mixture is lean, or a drop in voltage (below the reference voltage) if the mixture is rich.

Honda’s 5-wire “Lean Air Fuel” (LAF) sensor contains a special calibration Resistor in the connector. If the connector is damaged or contaminated with oil the resistance value will be off.

Saturn also uses a resistor in their wideband O2 sensor connector (pins 1 & 6). The resistor is typically 30 to 300 ohms. The PCM supplied reference voltage is 2.4 to 2.6 volts.

If an O2 sensor, wideband O2 sensor or A/F sensor fails due to coolant contamination, do not replace the sensor until you repair the root cause, or the new sensor will suffer the same fate.

© 2012 Rick Muscoplat

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P0152 with misfires

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I have been occasionally noticing misfires on cylinders 2,4,6 and usually no code was set other than P0300 (telling me there were multiple misfires). Today, I got a P0152 code! From looking at the description online, I bet this is the cause. Now, I have no idea how to troubleshoot or fix it. Here's the link I found: http://www.obd-codes.com/p0152 After reading the link, I think I should start by looking for a short in the wiring before replacing the O2 sensor. It doesn't seem likely that the O2 sensor would fail intermittently, but seems much more likely that wiring is intermittently shorting out. Has anyone dealt with this and have any advice before I dig in (likely this weekend)?  

Looks like I should be able to swap the right and left upper O2 sensors and see if the problem follows the sensor, or stays on bank 2. If no obvious wiring fault, I think I'll try that.  

Does anyone know which bank is 2-4-6? Is it the front or the rear bank of cylinders?  

Oxygen sensors have no way to induce a misfire, as they have absolutely no control over the ignition or timing. They can only control fuel. Here is the quote from the code explanation: "This code indicates that the o2 sensor was stuck too high or in the rich position. The PCM monitors this voltage and if it determines that the voltage is too high out of range for too long, P0152 may set. " A misfire, especially multiple misfires, can cause this code because it will dump unburned fuel in the exhaust. The O2 sensor will see this extra fuel and start leaning out the mixture because it "thinks" the mixture is too rich, but if it still sees the extra fuel in the exhaust, the code will be set. So from the OPs description, the O2 sensor seems to be doing its job. I would look at the misfire, even if no code was set.  

I thought about that too.. I see how the misfires could cause this code, but couldn't an electrical issue with the O2 circuit lean out the fuel on that bank and cause misfires that way? I'll probably just go ahead and check for issues in the wiring for that whole bank of cylinders and probably replace the spark plugs while I'm at it (they're not the issue but with 91K miles it's not too far from when they are due to be changed). All 3 cylinders drop out at the same time, so something electrical is causing that. Whether it is loss of spark, or something causing lack of fuel for all 3.  

My question is whether a wiring issue (short) could cause the ECU to *think* that the O2 is reporting rich(when it isnt), causing it to cut back fuel flow and then cause the cylinders to not fire or not fire properly.  

Highly unlikely. The ECU would not keep cutting the fuel until it reached zero, because the O2 has an operating range and if it goes outside that operating range, the ECU will ignore its signal and set a code. For one bank to cut out intermediately, a good start would be checking out the ignition system. Fuses, relays and the wiring harness.  

CampinMike said: I have been occasionally noticing misfires on cylinders 2,4,6 and usually no code was set other than P0300 (telling me there were multiple misfires). Today, I got a P0152 code! From looking at the description online, I bet this is the cause. Now, I have no idea how to troubleshoot or fix it. Here's the link I found: P0152 02 Sensor Circuit High Voltage (Bank 2 Sensor 1) After reading the link, I think I should start by looking for a short in the wiring before replacing the O2 sensor. It doesn't seem likely that the O2 sensor would fail intermittently, but seems much more likely that wiring is intermittently shorting out. Has anyone dealt with this and have any advice before I dig in (likely this weekend)? Click to expand...

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Fix P0152: Mechanic’s solutions that WORKED

The code P0152: O2 Sensor Circuit High Voltage (Bank 2 Sensor 1) points out a fault in the oxygen sensor circuit, indicating that the voltage signal from the oxygen sensor in Bank 2, Sensor 1, is higher than normal. This typically suggests a rich-running condition, where the engine is burning more fuel than air. It’s most likely caused by issues with the oxygen sensor itself or problems in the fuel system.

P0152 quick overview

In simple terms, this code means that one of the sensors measuring the amount of oxygen in the exhaust is sending a signal that’s too high, which usually means there’s too much fuel in the mix. It’s like your car is eating too much and not exercising enough, which isn’t healthy for it. It’s important to get it checked out and fixed to keep your car running smoothly and efficiently.

Free OBD2 scanner buyer’s guide

Complete guide to diagnosing oxygen sensor.

Follow this guide to diagnose oxygen sensors as there are close to a hundred DTCs related to Oxygen sensors and all the information that is needed to diagnose Oxygen sensor’s faults will be there.

How to fix P0152 – learn from mechanics

I looked into P0152 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Vehicle Information 1998 Dodge Ram 2500 8.0L

Issue + Repair History

• Customer noticed a gas smell and suspected misfire.
• Drove approximately 8 miles before the MIL (Malfunction Indicator Lamp) illuminated.
• Code P0152 (O2 sensor voltage high) was retrieved.
• Both O2 sensors initially stuck at 1.2V on startup for 10-15 seconds, then began switching normally.
• Concern about the sensors hitting 0.040V for a low and 0.950V for a high.
• Uncertainty about the code setting criteria for this truck.

Other OBD2 Codes + Test Results

• Sensor test passed.

What Are People Suggesting to Fix Issue

• Ensure engine runs for more than 2 minutes with coolant temp above 170 degrees F, as DTC sets when voltage is above 1.2 volts.
• Possible intermittent short in O2 sensor heater causing high voltage reading.
• Check fuel pressure regulator for leak into vacuum and leakdown of injectors after shutoff.

What Was the Final Fix

• Oxygen sensor was found to flatline at 1.2V after about 15 minutes of run time.
• Replacing the oxygen sensor resolved the issue.

Vehicle Information 2002 Chrysler Concorde LX 2.7L

• Initially came in with P0155 (B2S1 heater malfunction).
• Sensor tested bad, replaced, and vehicle released.
• MIL returned with P0152 stored; all O2 sensors flatlining at 0.3V.
• Replaced B2S1 with a known good sensor; other 3 sensors still flatline at 0.3V.
• After road test, P0152 returned with B2S1 flatlining at 0.1V and others at 0.3V.
• All splices, connectors, and grounds tested okay.
• Voltage at heater control 9.8V, 0.1 OHM to ground.
• O2 sensor signal 4.9V, return 2.5V (measured with sensor unplugged).
• Replaced both upstream O2 sensors and PCM reflash performed.
• Vehicle released but returned with P0300 (random misfire) and flashing MIL light.
• All OBD monitors complete with no sign of initial problem returning.
• Unable to reproduce the new problem, checked all engine and PCM grounds, even soaked engine bay with water.
• P0152- O2 sensor voltage high B2S1
• Check for software update for O2 codes.
• Use NTK or Mopar O2 sensors.
• TSB 18-031-02 calls for PCM reflash for similar O2 sensor codes.
• Test for continuity between the PCM and sensors.
• Hard wiring the O2 circuits can fix issues with internal wiring breakdown.
• Flashing the PCM and replacing sensors as one bad sensor can affect others.
• Found a poor ground connection at the PCM.
• Cleaned and repaired the connection.
• After test driving and checking monitors, the issue seemed resolved.

Vehicle Information 2004 Jeep Wrangler X 4.0L

• Vehicle brought in for cutting out issue.
• Customer insisted on replacing the fuel pump without testing, based on dealership diagnostics.
• Fuel pump replaced, but the problem persisted.
• Scanned for DTCs and found O2 sensor codes (P0151, P0152) and TPS voltage high (P0123).
• Tested TPS sensor with no signs of flat spots or dropouts.
• Replaced crank sensor and both O2 sensors, but the issue remained.
• Vehicle cuts out at about 2000 to 2500 RPMs, suspected TPS issue.
• Exhaust and fuel pressure retested, both okay.
• P0151- O2 sensor voltage high
• P0152 – O2 sensor voltage high
• P0123- TPS voltage high
• Wiring and connections to TPS sensor okay.
• O2 sensors wiring and connections test okay.
• Check if the vehicle is running rich and adjust accordingly.
• Inspect coolant sensor, MAP, or MAF for issues causing increased fuel.
• Ensure ECM pins are not bent and check for intermittent connections.
• Capture data stream during failure to see if CRK signal drops out.
• Use dealer parts, especially for O2 sensors, as aftermarket ones can cause repeat codes.
• Check wiring at PCM and wiggle connectors to induce the problem.
• The problem was the ASD (Automatic Shutdown) relay back feeding and killing the spark.
• Swapped with the starter relay which fixed the concern.
• Noted that the vehicle had aftermarket Bosch O2 sensors and advised the customer to get factory parts.

Vehicle Information 1998 Pontiac Firebird Trans Am 5.7L

• Car runs fine until it gets hot and is left to sit for 15-20 minutes.
• Upon restart, it develops a misfire mostly on bank 2 cylinders 4, 6, 8.
• Misfire not always detected by scan tools.
• Fuel pressure readings consistent, hot or cold engine.
• Codes P0154 and P0300 were in memory upon arrival.
• After hot soak, code P0152 set in, but vehicle has not set misfire code again.
• Misfire resolves after 3-5 minutes of running.
• No ignition leakage found in plugs and boots.
• Calibration update performed by dealer, which improved vehicle performance.
• P0300- Random misfire
• P0154- O2 sensor no activity bank 2 sensor 1
• P0152- O2 sensor high bank 2 sensor 1
• Fuel pressure KOEO pump run – 61 psi
• Fuel pressure KOEO pump stop – 55 psi
• Fuel pressure KOER – 60-62 psi
• KOEO fuel pressure drops – 15-25 psi in 10 min.
• Check for an injector bleeding down when hot.
• Inspect O2 sensor operation and wiring.
• Check for recalls and TSBs; consider warranty coverage.
• Investigate possible intake leak on the affected head.
• Look for water in the distributor from a leaking water pump.
• Check for moisture in O2 connector or replace O2 sensor.
• Check for leaking injectors on affected cylinders.
• Sent car to dealer for control module update.
• After receiving the vehicle from the dealer, it ran better with no more MIL or missing cylinders.

Vehicle Information 1997 Chevrolet Blazer 4.3L

• Intermittent check engine light with code P0152 (O2 signal high bank 2 sensor 1).
• Replaced fuel pressure regulator, both forward O2 sensors, and completed a full tune-up.
• Bank 2 fuel trim goes very negative, indicating a rich condition.
• After replacing several parts, the issue persisted.
• Eventually found a leaking injector on the right bank after several tests.
• Initially assumed no fuel pressure drop after key off meant no leaking injectors, which was incorrect.

Other Test Results

• Fuel pressure – 55 lbs.
• Check for raw fuel around the injector, and inspect the EGR for dirt due to overfueling.
• Inspect the O2 sensor harness for chafing or melting near the right side exhaust manifold.
• Check for water entry into the O2 sensor harness connector causing corrosion.
• Watch O2 voltages on the scanner, especially during cold start.
• Perform an injector flow/balance test to ensure good injectors.
• Check if fuel pressure holds after the pump shuts off.
• Inspect the fresh air boot for leaks before the MAF sensor.
• Look for a clean area in the intake manifold, which could indicate a leaking fuel regulator.
• Found a leaking injector on the right bank.
• Replaced the injector, which resolved the rich condition and the check engine light.

How to diagnose P0152

I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.

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Intermittent rough idle/misfire, codes P0152, P0152, P0300 and P1129

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O2 sensor help! P0152

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I have a 2006 dodge charger sxt 3.5l and I have a P0152 code being thrown at me. I have had this problem on and off for the last year or so. The car losses power and stutters a bit. Usually if I turn the car off and back on again the problem goes away. I had the bank 2 sensor 1 changed the first time it happened. It went away and came back. Then it went away for a couple of months then returned again. Can anyone confirm I had the correct sensor changed? They replaced the passenger side before the cat. Any clues on what my problem is?  

That is bank 2 sensor 1..high voltage? You had any work done? I just noticed you said cat, you mean exhaust? Sent from AutoGuide.com Free App  

I am not good with cars. That's what the guy told me when he replaced it. He said it was an o2 sensor before the cat. I apologize for my ignorance. I have not had any work done on the car since he replaced that bank 2 sensor 1 O2 sensor.  

Make sure it is tight, or run out and get an oem one, u may have an aftermarket one or it may be loose.  

Ok. it is tight. Guess I'll get an OEM one this weekend and give that a try. Is the O2 sensor the only thing i should try?Is it the one on the passenger side(bank2)?  

Yes thats the passenger side Sent from AutoGuide.com Free App  

Will I need any special too to remove said O2 sensor or will a regular wrench do the job? thanks for the input btw.  

http://m.wikihow.com/Change-an-Oxygen-Sensor . Hope this helps Sent from AutoGuide.com Free App  

Thanks man I appreciate the help.  

No problem, goodluck Sent from AutoGuide.com Free App  

I have the same issue. I cleared the code with my scanner and then the CEL came back on two days later. I let it ride for a day and it goes away. Now it's back on again.  

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Just started the car and the light is off again...just put in Riselone fuel treatment in.  

when mines came on i had just had my headers and exhaust installed..drove about 300 miles and it came on..and the trinity would not erase it..when i got my tune done by johan he said the tune would fix the issue and it has ever since and my key fob works again..cause when i had the CEL the key fob would not work..also before my tune with johan when i switched something small in my 93 tune just to see what would happen the light would go off but only for about 20 miles and then it would come back..so my only fix was a custom tune to fix the 02 sensor issue these cars always have  

Thats because it clears the codes when u make any change, and it resets all adaptives when u make a tune, like a battery reset almost  

Charging_Bull. Looks like you've done quite a bit to your ride. Many props bro. I've only done a deop in KnN filter so far and plan on doing a Mopar CAI instead.  

Started it up today and drove 30 miles. ..no CEL light.  

I just finished this issue with my car except it was bank 1 sensor 2. And here is the trick: 3.5L FOR THE CHARGER IS BANK 1 PASSENGER, BANK 2 DRIVER SIDE. sorry for the caps but this is a very odd one I had to learn and struggle with. Unplug the coupler of the driver side sensor and check codes(should have 4 now for 2/1) again to confirm then swap it out and reset. Sent from AutoGuide.com Free App  

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P0132,P0138,P0152,P0158, O2 Sensor Circuit High

• O2 sensor signal circuit shorted to voltage.
• O2 sensor return circuit shorted to voltage.
• O2 sensor signal circuit open/high resistance.
• O2 sensor return circuit open/high resistan.
• Powertrain Control Module (PCM).

Diagnostic test P0132,P0138,P0152,P0158, O2 Sensor Circuit High

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Engine surging, P0652, P0192, P1507, P1508

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1: Thank for all that help. All advice gets one free beer! Just come on over. Im in Austin Tx 2: Replaced Fuel filter, High pressure fuel sensor(that was fun to reach), and crank position sensor. MAP sensor is 6 mo old as well. At first I got the just the Fuel pressure low code (P0192) along with reference voltage low(P0652) which is why I replaced the high pressure fuel sensor. All codes came back again. I then threw in the crank sensor and now I get the P1507,1508 codes. which are for the Crank case filter. That was replaced about 6 months ago and 10k miles. Last two trips The only codes I have been getting are P1507,1508, and P0192. Im not sure what else is on that sensor chain that will cause the errors, FCA maybe? It also seems to take a while for the codes to re-appear after the engine is cold. They tend to only happen when the engine is warm. I have 175k miles on the truck. Signature is up to date. Thanks again, Smily  

Can't see your SIG from my phone. So forgive me. Try cleaning your CCP sensor. Ensure that your CCV line is free flowing. Redownload/ update your tune. Is your fuel rail plugged or shimmed? Any idea what your fuel/ rail psi looks like?  

Are you running an aftermarket lift pump, or additional fuel filtration?  

When was last oil change?  

Ok some other info. Batteries new in last 6 months. Terminals were cleaned right at the first problems. Alternator putting out 14.6v I do have extra fuel filtration (passive without a pump) but replaced all filter as soon as I started getting errors. Other than extra filtration the fuel system is stock. I have no fuel PSI monitoring Oil was changed 2000 miles ago. I dont think this is a CCV sensor issue although I will check it tomorrow. I think this is a 5v electrical issue. Got the following codes on the last drive a few hours ago: P0340-camshaft Position Sensor Circuit - Bank 1 Sensor 1 P0107-manifold Absolute Pressure Sensor Circuit Low P2228-barometric Pressure Circuit Low P0652-sensor Reference Voltage 2 Low P0192-fuel Pressure Sensor Low P1507-crankcase Filter Restriction P1508-crankcase Filter Restriction - Replace Filter I believe these are all on the same 5v power rail. Thanks again for the help!  

Yeah. I believe your theory holds water. Have you scrubbed and cleaned all grounds? Sorry I can't be of more help.  

You def have a 5v ref issue. I just got done fixing mine ended up being a corroded ground but it could be anything on that circuit too. I took the shop procedures and followed then with my multimeter to rule out any sensor or harness issues. Mine came about from a cam Sensor taking a crap on me and the of course the 0652 popped too FYI in clearing that code too , you have to do the 4 drive cycle thing too and then if course it will clear itself. Did you end up getting the flashing ETC light with all this ?  

@63boxtop where are all the grounds located? I did clean the engine ground near the ECM and the one on the chassis that is closest to the ECM. I will clean all the grounds I can find later today. However this is a texas truck and the grounds I have seen so far all look great. The check engine light and the lightning bolt (ETC?) both come on. I am reading and clearing codes with the Smarty. One think I want to check is; my alarm has a remote start that I think ties to the crank position sensor. this is just a vampire tap type connection not a soldered or waterproof connection. I saw this yesterday when I was cleaning the ground near the ECM Where can I get the shop troubleshooting procedure for this?  

I just cleaned the 3 body grounds under the hood by the two batteries. I soldered and shrink wrapped the remote start sensor on my alarm system. Pulled the ECM and cleaned all the pins with DeoxIT: http://www.amazon.com/CAIG-DeOxit-Cleaning-Solution-Spray/dp/B0002BBV4G Ran the truck and got the following 3 codes. P051b-crankcase Pressure Sensor Circuit Range/performance P0652-sensor Reference Voltage 2 Low P0192-fuel Pressure Sensor Low  

i pulled the procedures from this forum acutally in the search function just use P0652 your not going to be able to just clear that one because you have to do 4 drive cycles which consist of taking it to drive and moving it, placing it in park and shutting the motor off and doing that 3 more times, that will clear assuming your other issue that is causing the P0652 is resolved too. you said you already changed the uel rail pressure sensor correct? also do a search on P0652 i have several treads on my issue and some fuel rail pressure oddities. Keep in mind if you have one bad sensor on that 5V reference circut it can cause the P0652 and have you chasing your tail. Once you read thru those procedures for troubleshooting it lets you know that you could have a grounded out harness somewhere in the loop too. typically this is not the case though.  

Well I think I got it: Crank Case Pressure Sensor I unplugged it and everything runs great! Doesnt even throw a check engine light. There is a DTC code tho. Ill pull the sensor and check it tomorrow.  

Go here for the 2008 factory service manual: CarboniteCummins - Articles The site is owned by Flopster843, a member on this site so shoot him a thanks if you download it. PM me if you have problems downloading it and I can give you some help.  

Well... I guess I have more problems. Went on a longer drive and: P051b-crankcase Pressure Sensor Circuit Range/performance (expected because sensor is unplugged) P0652-sensor Reference Voltage 2 Low P0192-fuel Pressure Sensor Low So I Ordered the crank pressure sensor and the FCA. and on the drive home from church today... The A/C is dead now. Checked Freon levels and they are fine. Plenty of pressure. The clutch is just not engaging. I think the high/low side pressure sensors are sitting on the 5v rail as well. Anyhow... Any other ideas? TIPM? ECM? Short? bad sensor? im downloading the service manual now and will run through the trouble shooting probably on Wed. I have some work stuff coming up... Thanks again for any help!  

Well when it rains it pours... A/C clutch blown open. showing 50k Ohm measured both ways. manually applying 12v to the clutch and it wont engage. Gonna replace the whole unit as its the original with 175k miles on it!  

on the 3rd gen trucks the AC does sit on the 5v refrence. that may take care of your P0652 code. did you get your other parts in yet?  

I have replaced: Crank Position sensor. (still need to do cam position, misread the fact they are the same yet 2 separate sensors) High pressure full sensor Fuel control actuator MAP Crank case pressure. Disconnected EGR valve. New A/C compressor and Clutch. Cleaned all ground points. Clean ECM connectors. It is definitely temperature dependent which makes every troubleshooting session into at least a 30 minute drive on top of doing the labor. So anyway last drive I took and got the following codes: P0652-sensor Reference Voltage 2 Low P0192-fuel Pressure Sensor Low P1507-crankcase Filter Restriction P1508-crankcase Filter Restriction - Replace Filter Engine surging a lot and almost stalls at idle. AHHHH!!! Any other ideas? This is a really stupid design to put all of these sensors on one 5v source. Im half temped to buy a bunch of DC-DC stepdown regulators and break each sensor out on its own supply so I never have to deal with this again! Thanks again for any help!  

Hmm Service manual shows Exhaust Pressure sensor sitting on 5v as well. I have noticed that the exhaust break seems to be working harder(better) lately... Is this sensor disabled on a deleted truck?  

i believe it is based on the volt meter reading i recieved, but i cannot be for certain. there is a small hole in that housing that gets plugged with carbon and effects the sensor reading capability. i just used safety wire to clean mine out. i know its frustrating but you'll get it  

Well i figure ill give you all an update. After the last post above I cleared the codes... Thats it. I have since driven the truck for 1 hour on two different occasions in 90+ degree heat and as mysteriously as the problem appeared, its gone now. I had an exhaust pressure sensor on the way so I put that in this morning and cleaned out the tube leading to it. The EB is behaving like normal again. So long story short. I have no idea what I did to fix it or if it will return again.  

Sometimes good karma is all it takes  

Hi guys. I am here looking for solutions that have helped other people having similar issues as I am. So Tuesday my truck was choking shuddering and jerking and displaying codes p0431 p0652 at first and I cleared them. Then drove 5 more miles and was fine then stalled out and showed codes again. Then waited 10 minutes and it started fine so I just drove it 50 feet to get out of the intersection that I stalled in. Tuner showed p061c and p2280 but the MIL light didn't come on and truck seemed normal. Dealership said they had to replace crankshaft sensor and turbo speed sensor. They test drove and it was fine but when I picked it up and started it, it was immediately chokey sounding, puttered, and stalled out. They cranked it and it turned over after cranking for 30 seconds. Same codes came up and the tech said there must be a fried circuit in the PCM. I would like to take it back to diesel shop who did my deletes but they have been awful about returning phone calls and not wanting to help me at all. I'm pretty pissed that after handing over $5k they wash their hands of customer service. I'm beginning to regret deleting as much as I love how the truck drives, it is my work truck and I can't run a business with an unreliable vehicle. Any help would be greatly appreciated. Thank you!  

@Justincase. You can read through this thread to see all that I had to do. Almost all of the engine sensors are powered by a single 5v power source. Any one of about 10 sensors can go bad and cause the others to give a false error. It all depends on which one the computer is reading at the time. Most of the sensors are rather cheep so I just started buying them and swapping them out myself. (figured it would be cheaper than letting the dealer charge me for labor) As you can see from the dates on the thread its been 4 months since I had these issues and have not had a single issue since. This has nothing to do with the deletes. -Smily  

Thank you. I will do my best. I saw you mentioned your exhaust brake acting up, mine has been acting weird on and off also but not while codes present. What was yours doing? 2012 3500 Mega DRW 4x4. S&B air intake, Pusher system, EGR delete, DPF delete, 5" TBE. Mini Maxx  

Your one code is for engine position doesn't match the ecm calculated position. The ecm uses the crankshaft and cam position sensors to see what the engine position is so I think I'd start there. Another code is low supply voltage to the engine sensors so start with checking the supply voltage at one sensor connection. If lower than 5v then start disconnecting sensors until the voltage reads normal. The last one disconnected is the culprit. If its still low with all sensors disconnected then its either a wiring short in the loom or the ecm. That's the best I've got for you and I got it from the 2008 factory manual. Hopefully its relevant to your MY  

Thank you for the reply! What do I do about the engine position vs what ECM says it's at? Do I clear it and do the 4 drive cycle thing? 2012 3500 Mega DRW 4x4. S&B air intake, Pusher system, EGR delete, DPF delete, 5" TBE. Mini Maxx  

Just breaking way harder than normal. I cleaned tube that leads up to it and it was filthy. I used some break cleaner and compressed air.  

Ok. Thank you. Mine occasionally will act weak and make almost a hissing sound like air is leaking 2012 3500 Mega DRW 4x4. S&B air intake, Pusher system, EGR delete, DPF delete, 5" TBE. Mini Maxx  

I would hope either the low voltage is causing an incorrect sensor signal or one of the position sensors (crank or cam) are bad giving you that error. I would start checking for a voltage problem first, then if the voltage is good then replace the crank sensor and see what happens. Then if the error continues replace the cam sensor with the crank sensor (they're the same sensors) and so on. Hopefully its a voltage issue from a bad sensor or short that's not hard to fix and not the ecm.  

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Dodge Journey P0452:  FUEL Tank Pressure Low Diagnosis

P0452 is a generic OBD II code that can occur in the Dodge Journey.  It means that your Journey’s EVAP system has detected low fuel tank pressure.

The evaporative emissions control system (EVAP) sends fuel vapors from the fuel tank to the intake manifold to be burned off.  When the pressure in the system is too low, P0452 is generated.

P0452 should not be considered a breakdown risk when it is the only code that you are experiencing, and is more often than not remedied by a new fuel cap.

P0452 is more often than not caused by a bad gas cap

More often than not, P0452 is not going to be accompanied by any noticeable symptoms, and your Journey will continue to run fine.

Here are some of the more common symptoms that can arise with this code:

• Check engine light (obviously)
• Smell of fuel (indicates loose fuel cap or EVAP leak)
• Hissing sound (indicates vacuum leak

P0452 Causes: Dodge Journey

Here are some of the more common causes of P0452 in the Dodge Journey:

• Loose gas cap
• Bad fuel tank pressure sensor or wiring
• Clogged charcoal canister
• Vacuum leak
• EVAP purge solenoid failure

Dodge Journey P0452 Diagnostic Procedure

Here’s a solid order of diagnosis when dealing with P0452 in your Journey:

1. Check for Other Codes

If P0452 is the only trouble code that you are getting, skip right on down to the next section.  If it is not, cross referencing the other code’s causes with the common causes of P0452 can really help you eliminate some possibilities.

2. Check the Gas Cap

P0452 indicates that your Journey’s fuel tank pressure sensor has detected that the pressure in the fuel tank is too low.  If the gas cap is not tight, or making a good seal, that causes this code (a lot).

Remove the fuel cap and inspect it.  Pay attention to the rubber ring that would snug to the fuel inlet.  If it is dry rotted or damaged, a replacement is likely to fix P0452.

OBDII codes stay in the system for a while, even after the problem has been fixed.  If you believe that the fuel cap was loose, or you changed it, you’ll need to clear the code with a code scanner and see if it comes back or not.

Also, make sure that nothing on the fuel inlet would be preventing a good seal.  If it has gunk built up or mud on it, you’ll need to use a wet rag or some WD-40 to clean it off.

If it does come back, we’ll need to move on to the next step.

3. Check the Fuel Pressure Readings

Unfortunately, outside of checking the gas cap (which more often than not is the cause), diagnosing P0452 gets tricky.

A mechanic would use a professional OBDII scanner to check the fuel tank pressure readings from your Journey’s fuel tank to see if there is vacuum in the tank.

If it doesn’t look right, the wiring to the fuel pressure sensor would need to be inspected.  

If that doesn’t help anything, the tank pressure sensor itself would need to be replaced.

If everything looks fine, they’d move on to checking the EVAP system.

4. EVAP System Issues

A failure in the EVAP system itself can cause P0452.  Here’s how a good mechanic would go about diagnosing it.  It is really worth a watch if you are going to try and tackle this yourself.

A Common Diagnostic Mistake With P0452

A common mistake that people make when diagnosing P0452 is to do anything before checking the gas cap.  

Or, they’ll keep going on with the diagnostic process after addressing the fuel cap because they did not clear their trouble codes.

Once you replace the gas cap or tighten it, drive your Journey for a while to see if the code clears before moving any further with the diagnosis.

Dodge Journey P0452 Conclusion

P0452 is more often than not caused by a bad gas cap.  If your gas cap is fine, then this can be a tough code to diagnose.