What does code P23FA mean?

Q: What does code P23FA mean?

Cylinder 9 Injector B Air-Fuel Ratio Imbalance. P23FA indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 9, specifically affecting injector B, which usually means the engine is not achieving the correct combustion balance on that cylinder. The computer monitors crankshaft speed fluctuations and oxygen sensor feedback to identify a cylinder that is contributing disproportionately to the overall air-fuel mixture.

DTC codes / P23xx · Ignition system and misfire / P23FA

P23FACylinder 9 Injector B Air-Fuel Ratio Imbalance

P23FA indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 9, specifically affecting injector B, which usually means the engine is not achieving the correct combustion balance on that cylinder. The computer monitors crankshaft speed fluctuations and oxygen sensor feedback to identify a cylinder that is contributing disproportionately to the overall air-fuel mixture.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.