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DTC codes / P23xx · Ignition system and misfire / P23F4

P23F4Cylinder 3 Injector B Air-Fuel Ratio Imbalance

P23F4 indicates that the engine control module has detected an air-fuel ratio imbalance specifically on cylinder 3, injector circuit B, meaning that cylinder's fuel delivery is not matching what the computer commands. The module compares crankshaft speed fluctuations and oxygen sensor feedback to flag this cylinder as deviating from the rest of the engine.

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.

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