Guide To P02AE OBD Error Code Solutions

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p02ae-obd-ii-trouble-code-cylinder-6-fuel-trim-at-max-limit-solution-pressure-regulator-spark-plugIs your car engine misfiring and having delayed start up? Is there black smoke emitting from the car exhaust? Is there a sudden drop in the fuel economy? All these are the indications to the OBD Code P02AE being stored and flashed in the Powertrain Control Module (PCM).

OBD-II Code Decreased engine performance is defined as a Cylinder 6 - Fuel Trim at Max Limit

The PCM utilizes the fuel trim system to increase or decrease fuel delivery and the input signals from the oxygen sensors provide the PCM with the data required to adjust fuel trim. The PCM uses variations in fuel injector pulse width modulation to effect air/fuel ratio changes.

Small variations in fuel trim, typically measured in positive or negative percentage, are normal and hardly cause a code P02AE to be stored. Maximum fuel trim parameters which can also be positive or negative are normally in the twenty-five-percent range. Once this maximum threshold has been exceeded, a code of this type will be stored.

What causes the problem of Cylinder 6-Fuel Trim at Max Limit?

• Fuel pump fault/failure
• Fuel pump relay fault/failure
• PCM faulty
• Faulty fuel pressure sensor
• Electric fuel pressure regulator faulty
• Fuel filter or other parts of the fuel system clogged/restricted
• Damaged wiring such as a short to ground
• Fuel tank low fuel levels

1. Fuel Pump - Damaged fuel pump will affect the fuel delivery system and the internal combustion process. Replace it immediately.
2. Fuel Pressure Sensor - If the sensor is faulty, the PCM will not be able to interpret the fuel pressure correctly and will affect the fuel delivery system and the engine performance.
3. Fuel Pressure Regulator - Faulty regulators will not be able to determine the duel fuel requirement and hamper the fuel delivery system. Replace the damaged one now!
4. Fuel Injection - The fuel injection system works by pressurising and injecting the fuel, the system forces it into air that has been compressed to high pressure in the combustion chamber. Replace faulty fuel injectors and parts as it affects the combustion process and the performance output.
5. Fuel Filters - A fuel filter is used to screen out dirt particles from the fuel, normally made into cartridges containing a filter paper. Replace old and clogged fuel filters now!
6. Diagnostic Tools - Use factory grade OBD scan tools to diagnose an OBD code error problem. Buy quality diagnostic tools from us now!
7. Spark Plugs - Check if the spark plugs are in the right condition and replace them if not. Buy new spark plugs from us now!
8. Powertrain Control Module - Although this error is rare, but check for faulty PCM and if it requires reprogramming or not. Find quality components from us.

P02AE should be considered severe since excessive fuel pressure may lead to a variety of drivability issues and cause internal engine and catalytic converter damage.

Common Symptoms

• Delayed cold start and diminished engine performance
• Black smoke emission from the exhaust system
• Reduced fuel efficiency
• Misfires codes stored
• Engine misfire and rough idle

To correct the OBD error, try to repair or replace the below stated components;

• Fuel pressure regulator replacement
• Fuel pump replacement
• Fuel filter replacement
• Faulty fuel injectors or other fuel system related sensors replacement
• Repairing or replacing electrical wiring or connectors
• Faulty fuel pump relay replacement
• Removal of defective fuel pump relay
• Installing new fuel pump relay
• Testing the fuel pressure and codes cleared with a scanner or gauge

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A mechanic may start with a good visual inspection of the fuel system and the following components:

• Fuel tank
• Fuel pump
• Fuel filter
• Lines and hoses
• Electrical wiring
• Electrical connectors
• Sensors
• Injectors

Check for other problematic parts of your vehicle's fuel system that are not listed here that are specific to your particular vehicle.

During an inspection, the mechanic will take note of any damages to the system and repair them before proceeding with the diagnosis.

After performing the visual inspection, the mechanic will perform a fuel pressure test to test the functionality of all fuel system sensors.

If all the parts are checked for perfect operation, then suspect for faults in the Powertrain Control Module (PCM). Although, this error is rare but faulty components should be repaired or replaced and the system should be reprogrammed for eliminating any error.

Common Mistakes When Diagnosing The P02AE Code

A most frequent or common mistake when diagnosing the P02AE code can be replacing the fuel pressure regulator or fuel pump without checking if it is bad or not.

A trouble code is simply a sensor giving a reading that the Powertrain Control Module sees as out of specification. Sometimes, mechanics will see a trouble code and take that for what is actually wrong with the car. Just because a particular part is mentioned in a trouble code, it does not mean that the part is faulty.