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DTC codes / P23xx · Ignition system and misfire / P23F6

P23F6Cylinder 5 Injector B Air-Fuel Ratio Imbalance

P23F6 is a generic powertrain code indicating that the engine control module has detected an air-fuel ratio imbalance specifically on cylinder 5, injector circuit B. The computer monitors crankshaft speed fluctuations and oxygen sensor feedback to identify that cylinder 5 is not contributing its share of power or is running at a different air-fuel mixture than the other cylinders.

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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