What does code P21FF mean?

Q: What does code P21FF mean?

Fuel Control System B Too Rich at Higher Load (Bank 2). P21FF indicates that the engine computer has detected an excessively rich fuel mixture in the fuel control system for bank 2 when the engine is operating under higher load conditions. The powertrain control module monitors the bank 2 oxygen sensor signals and fuel trim corrections, and it sets this code when the long-term fuel trim has reached its rich limit and the exhaust oxygen sensor still reports a rich condition despite the computer's efforts to lean the mixture.

DTC codes / P21xx · Fuel and air metering / P21FF

P21FFFuel Control System B Too Rich at Higher Load (Bank 2)

P21FF indicates that the engine computer has detected an excessively rich fuel mixture in the fuel control system for bank 2 when the engine is operating under higher load conditions. The powertrain control module monitors the bank 2 oxygen sensor signals and fuel trim corrections, and it sets this code when the long-term fuel trim has reached its rich limit and the exhaust oxygen sensor still reports a rich condition despite the computer's efforts to lean the mixture.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.