What does code P22A2 mean?

Q: What does code P22A2 mean?

NOx Sensor Circuit Intermittent (Bank 1 Sensor 2). P22A2 indicates that the powertrain control module (PCM) has detected an intermittent fault in the nitrogen oxide (NOx) sensor circuit for bank 1 sensor 2, which is the downstream NOx sensor after the selective catalytic reduction (SCR) catalyst. The PCM monitors the sensor's signal and heater circuit for brief opens, shorts, or erratic voltage fluctuations that do not last long enough to set a continuous fault code.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22A2

P22A2NOx Sensor Circuit Intermittent (Bank 1 Sensor 2)

P22A2 indicates that the powertrain control module (PCM) has detected an intermittent fault in the nitrogen oxide (NOx) sensor circuit for bank 1 sensor 2, which is the downstream NOx sensor after the selective catalytic reduction (SCR) catalyst. The PCM monitors the sensor's signal and heater circuit for brief opens, shorts, or erratic voltage fluctuations that do not last long enough to set a continuous fault code.

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.