What does code P22FC mean?

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22FC

P22FCNOx Sensor Performance - Slow Response Low to High (Bank 1 Sensor 2)

P22FC means the engine computer has detected that the downstream nitrogen oxide (NOx) sensor on bank 1 is responding too slowly when the exhaust NOx concentration rises from a low level to a high level. The sensor is still producing a signal, but its transition from a lean/low-NOx reading to a rich/high-NOx reading takes longer than the calibration allows, so the computer cannot trust it for emissions control.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

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