Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble balancing the amount of fuel going to cylinder 11, and it's using as much as it can to fix the problem.
The engine control module (ECM) is adjusting the fuel mixture for cylinder 11 to its maximum limit to maintain proper engine performance.
The P02C2 code indicates that the fuel trim for cylinder 11 has reached its maximum adjustment limit. This means the ECM is trying to compensate for an imbalance in the air-fuel mixture by adding or subtracting fuel, but it has reached the limit of its adjustment capabilities. This can be caused by issues such as a vacuum leak, faulty fuel injector, or problems with the mass air flow sensor.
• Check Engine Light is on
• Poor fuel economy
• Rough idle
• Engine misfire
• Reduced engine performance
• Vacuum leak
• Faulty fuel injector
• Mass air flow sensor malfunction
• Exhaust leak
• Faulty oxygen sensor
ECM: Engine Control Module, the computer that controls the engine's operations.
Fuel Trim: Adjustments made by the ECM to the amount of fuel injected into the engine.
• Use an OBD-II scanner to confirm the code.
• Inspect for vacuum leaks around cylinder 11.
• Check the fuel injector for cylinder 11.
• Test the mass air flow sensor.
• Inspect the oxygen sensors.
• Repair any vacuum leaks.
• Replace or clean the fuel injector for cylinder 11.
• Replace the mass air flow sensor if faulty.
• Replace faulty oxygen sensors.
• Clear the code and test drive the vehicle.
• OBD-II scanner
• Vacuum gauge
• Multimeter
• Fuel injector cleaner
• Basic hand tools
$150 - $600
Moderate
• BMW 7 Series
• Mercedes-Benz S-Class
• Audi A8
• Regularly inspect and replace air filters.
• Perform routine engine maintenance.
• Use quality fuel to prevent injector clogging.
Engine Performance
• Avoid hard driving until the issue is resolved.
• Regularly maintain your vehicle to prevent such issues.
Check with the manufacturer for warranty coverage on engine components.
This code is common in vehicles with high mileage or those that have not been regularly maintained.
Moderate – It should be addressed soon to prevent further engine damage.
Ignoring this code can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle idling
Cylinder 11 is typically located on the engine block; refer to the vehicle's service manual for exact location.
Q: Can I drive with a P02C2 code?
A: It's not recommended to drive for extended periods as it can lead to further engine damage.
Q: Will a P02C2 code cause my car to fail emissions tests?
A: Yes, it can cause your car to fail emissions tests due to improper fuel mixture.
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Fitment Required · Vehicle-fitment part
Relevant when the code or supporting diagnostics point toward upstream or downstream oxygen-sensor faults.
This code family often involves upstream or downstream oxygen-sensor diagnosis.
Verify exact sensor position and vehicle fitment before buying.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.