P02AB OBD Error Code: Problem & Solutions

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Is your Car’s Check Engine Light illuminating on the dashboard? Do you find sudden decrease in the fuel economy? And is the car engine running rough with increased emissions from the exhaust? This might be the indication of problems with the fuel delivery system of the car which in other words can be an OBD code P02AB error.

OBD code P02AB code means that the powertrain control module (PCM) has detected an extremely rich condition in a specific engine cylinder, in this case it is cylinder 5.

Rich condition normally means that there is more amount of fuel in the chamber as compared to the air is reference to the air to fuel ratio required for proper combustion and efficiency. If the PCM detects any abnormality in the fuel trim voltage output, especially going negative in this case, it means that the fuel volume has to be adjusted and thus the OBD code P02AB gets stored in the system.

What causes the problem of Cylinder 5 Fuel Trim at Min Limit?

• Defective fuel pressure regulator
• Clogged filter screens in the pressure regulator
• Kinked, or damaged fuel return line
• Wrongly installed fuel filters
• Defective fuel pressure sensor
• Faulty fuel pump driver/relay
• Open, short, or corroded electrical wirings and connections

1. Fuel Pump - Check for damaged/faulty fuel pumps that might not be able to deliver the fuel properly and replace them as needed. Buy from us now!
2. Fuel Pressure Sensor - Reduced or increased pressure can affect the fuel to air ratio and thus the sensor needs to work properly for correct decisions by the PCM. Replace now!
3. Diagnostic Tools - Use professional OBD scan tools to diagnose an OBD code error problem. Buy quality diagnostic tools from us now!
4. Spark Plugs - Faulty spark plugs are the easiest to detect and cheapest to resolve the OBD error. Replace now!
5. Air Filter - Check for clogged or damaged air filter and replace to make clear and clean air to enter the cylinder for combustion. Buy new products form us now!
6. Fuel Injection - Increased fuel in the cylinder can lead to rich engine condition and hamper the performance because of affected fuel to air ratios. Thus, check for faulty fuel injection system and replace if needed.
7. Powertrain Control Module - PCM can also be faulty and interpret the information wrongly thus leading to wrong decision with respect to fuel delivery system and air intake systems. Replace faulty PCM now!

Following are the symptoms of OBD code P02AB error;

Common Symptoms

• The vehicle put into failsafe mode by the PCM to prevent further damage to the vehicle
• Vehicle running poorly
• Check Engine Light illuminated
• Misfiring of car engine
• Lean and rich engine conditions
• Increased fuel consumptions
• Black smoke from tailpipe
• Oil dilution in severe cases
• Fouled spark plugs
• Rough engine idles
• Engine stalling and not starting

Following are the most common treatment to the problem related to OBD Code P02AB:

Damaged fuel lines replacement

Fuel pump replacement

Faulty fuel pressure sensor replacement

Fuel pressure regulator replacement

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• Record all stored fault codes and available freeze frame data. This data can be useful if an intermittent fault is diagnosed later on.
• Sine code P02AB indicates rich condition in the cylinder 5, it is unlikely to be caused by wiring issues, unless the fuel pressure regulator is electrically operated. Also check for problematic fuel pressure sensor.
• Check for damaged fuel pump and fuel filters and replace if needed.
• Access the injector connector (for the injector in question) and use the DVOM to test for injector voltage and a ground pulse (the latter from the PCM).
• Connect the fuel pressure gauge to the system, and leave the code reader connected, if the vehicle can start. Start the engine, and monitor the actual pressure in the fuel system via the gauge, and the scanner. If the pressure rises steeply, or remains steady whatever the reading, it is almost certain that the pressure regulator is faulty.
• If the pressure regulator is located on the fuel rail, it is most likely to be spring operated, but supplied with vacuum assistance. Replace the vacuum hose if a leaky, and again examine the pressure regulator. If the problem persists and there is a strong vacuum present, and the fuel pressure regulator needs to be replaced. After replacement, check if the code reappears.
• If the vehicle cannot start, it is most likely because the excessive fuel pressure is deactivating the pump. Consult the manual on the correct procedure to remove the pump, and to replace the regulator.
• Clear all codes and test drive the vehicle with a suitable scanner connected to record the fuel pressure under changing engine loads/speeds. If the scanner cannot monitor live data streams, retest the fuel pressure after the test drive, and scan the system to see if the code has returned.
• In the unlikely event that the code persists, it is possible that there is an intermittent fault present, which may have to be allowed to worsen before an accurate diagnosis and repair can be made. Check for faults in the Powertrain Control Module and replace or repair as per the situation.

Common mistakes when diagnosing P02AB Code

• Replacing components without testing them is the most common mistake made during P02AB diagnostic
• Not performing step by step diagnosis leads to repairs that do not fix the faults and wasted time, effort, and money
• P02AB is commonly caused by a kinked fuel line, this is usually due to something hitting the line. The only way to see this is to perform a thorough visual inspection.