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DTC codes / P23xx · Ignition system and misfire / P23FB

P23FBCylinder 10 Injector B Air-Fuel Ratio Imbalance

P23FB indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 10, specifically for injector circuit B, which usually refers to a secondary injector or a specific driver circuit within a multi-injector arrangement. The computer monitors crankshaft speed fluctuations and oxygen sensor feedback to identify that cylinder 10 is not contributing its expected share of power, often due to a fuel delivery or combustion quality issue.

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.

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