What does code P23FF mean?

Q: What does code P23FF mean?

Bank 2 System B Air-Fuel Ratio Imbalance. P23FF indicates that the powertrain control module has detected a significant air-fuel ratio imbalance on bank 2, specifically for the sensor or circuit designated as System B. The computer monitors oxygen sensor feedback and fuel trim values to determine that the engine is not achieving the expected stoichiometric ratio on that bank, which can affect emissions and performance.

DTC codes / P23xx · Ignition system and misfire / P23FF

P23FFBank 2 System B Air-Fuel Ratio Imbalance

P23FF indicates that the powertrain control module has detected a significant air-fuel ratio imbalance on bank 2, specifically for the sensor or circuit designated as System B. The computer monitors oxygen sensor feedback and fuel trim values to determine that the engine is not achieving the expected stoichiometric ratio on that bank, which can affect emissions and performance.

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.