What does code P23F8 mean?

Q: What does code P23F8 mean?

Cylinder 7 Injector B Air-Fuel Ratio Imbalance. P23F8 indicates that the powertrain control module (PCM) has detected an air-fuel ratio imbalance on cylinder 7 that is specific to injector B, meaning the fuel injector circuit or its mechanical function is not delivering the expected fuel quantity. The PCM compares crankshaft speed fluctuations or wideband oxygen sensor feedback cylinder by cylinder and flags this code when the imbalance exceeds a calibrated threshold.

DTC codes / P23xx · Ignition system and misfire / P23F8

P23F8Cylinder 7 Injector B Air-Fuel Ratio Imbalance

P23F8 indicates that the powertrain control module (PCM) has detected an air-fuel ratio imbalance on cylinder 7 that is specific to injector B, meaning the fuel injector circuit or its mechanical function is not delivering the expected fuel quantity. The PCM compares crankshaft speed fluctuations or wideband oxygen sensor feedback cylinder by cylinder and flags this code when the imbalance exceeds a calibrated threshold.

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.