What does code P22FD mean?

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22FD

P22FDNOx Sensor Performance Slow Response High to Low Bank 1 Sensor 2

P22FD means the engine computer has detected that the downstream nitrogen oxide (NOx) sensor on bank 1 is responding too slowly when the exhaust NOx level drops from high to low. The sensor's signal is supposed to fall quickly as the exhaust cleans up, but the computer saw it lag beyond an acceptable time window.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.