What does code P21F7 mean?

Q: What does code P21F7 mean?

Fuel Control System B Too Rich Off Idle (Bank 2). P21F7 indicates that the engine computer has detected an excessively rich fuel mixture on Bank 2 when the engine is running above idle speed. The powertrain control module uses oxygen sensor feedback to monitor fuel trim and sets this code when the long-term fuel trim on Bank 2 exceeds a calibrated rich threshold off idle, meaning too much fuel is being delivered for the air entering that bank.

DTC codes / P21xx · Fuel and air metering / P21F7

P21F7Fuel Control System B Too Rich Off Idle (Bank 2)

P21F7 indicates that the engine computer has detected an excessively rich fuel mixture on Bank 2 when the engine is running above idle speed. The powertrain control module uses oxygen sensor feedback to monitor fuel trim and sets this code when the long-term fuel trim on Bank 2 exceeds a calibrated rich threshold off idle, meaning too much fuel is being delivered for the air entering that bank.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.