What does code P23F3 mean?

Q: What does code P23F3 mean?

Cylinder 2 Injector B Air-Fuel Ratio Imbalance. P23F3 indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 2 that is specifically attributed to injector B, which usually means the secondary fuel injector on that cylinder is not delivering the expected fuel quantity. The computer compares crankshaft speed fluctuations and oxygen sensor feedback to identify which cylinder is contributing unevenly to the engine's air-fuel mixture.

DTC codes / P23xx · Ignition system and misfire / P23F3

P23F3Cylinder 2 Injector B Air-Fuel Ratio Imbalance

P23F3 indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 2 that is specifically attributed to injector B, which usually means the secondary fuel injector on that cylinder is not delivering the expected fuel quantity. The computer compares crankshaft speed fluctuations and oxygen sensor feedback to identify which cylinder is contributing unevenly to the engine's air-fuel mixture.

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.