What does code P23FC mean?

Q: What does code P23FC mean?

Cylinder 11 Injector B Air-Fuel Ratio Imbalance. P23FC indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 11, specifically related to injector B, meaning the engine's oxygen sensor feedback shows that cylinder is running either too rich or too lean compared to the others. The computer monitors crankshaft speed fluctuations and exhaust oxygen content to flag this cylinder as the source of the imbalance.

DTC codes / P23xx · Ignition system and misfire / P23FC

P23FCCylinder 11 Injector B Air-Fuel Ratio Imbalance

P23FC indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 11, specifically related to injector B, meaning the engine's oxygen sensor feedback shows that cylinder is running either too rich or too lean compared to the others. The computer monitors crankshaft speed fluctuations and exhaust oxygen content to flag this cylinder as the source of the imbalance.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.