Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the computer in your car has detected that the air and fuel mixture in cylinder 11 is not right. It's like when you mix too much milk in your cereal, and it doesn't taste right.
The engine control module (ECM) monitors the air-fuel ratio in each cylinder to ensure optimal combustion. If the air-fuel mixture in cylinder 11 is not balanced, it triggers this code.
P23FC indicates that the ECM has detected an imbalance in the air-fuel ratio for cylinder 11, specifically related to Injector B. This could be due to issues with the injector itself, air leaks, or problems with the fuel delivery system.
• Engine misfire
• Reduced fuel efficiency
• Rough idling
• Faulty fuel injector
• Air intake leak
• Fuel pressure issues
ECM: Engine Control Module
Injector: A device that delivers fuel into the engine's combustion chamber
• Check for vacuum leaks around cylinder 11.
• Inspect the fuel injector for clogs or damage.
• Test fuel pressure to ensure it's within specifications.
• Replace or clean the faulty injector.
• Repair any air intake leaks.
• Adjust or replace the fuel pressure regulator.
• OBD-II scanner
• Fuel pressure gauge
• Multimeter
$200 - $600
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance of fuel injectors
• Ensure air intake system is sealed
• Use high-quality fuel
Engine Performance
• Have your vehicle inspected by a professional.
• Avoid driving long distances until the issue is resolved.
Check with your vehicle manufacturer for warranty coverage on fuel injectors.
This code has been reported in vehicles with high mileage or those that frequently use low-quality fuel.
Moderate – It is advisable to address this issue soon to prevent further engine damage.
Ignoring this code may lead to increased emissions and potential damage to the catalytic converter.
• Engine at operating temperature
• Vehicle in a stationary position
The fuel injector for cylinder 11 is located on the engine block, typically on the side of the cylinder head.
Q: Can I drive with a P23FC code?
A: It's not recommended to drive for long periods with this code, as it can lead to engine damage.
Q: How can I prevent air-fuel ratio imbalances?
A: Regular maintenance and using high-quality fuel can help prevent such issues.
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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.