What does code P22AF mean?

Q: What does code P22AF mean?

O2 Sensor Reference Voltage Performance (Bank 1 Sensor 2). P22AF indicates that the powertrain control module (PCM) has detected an abnormal reference voltage on the downstream oxygen sensor (Bank 1 Sensor 2) circuit. The PCM monitors the sensor's reference voltage, which should remain stable within a specific range; when the voltage falls outside that range or behaves erratically, the code is set.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22AF

P22AFO2 Sensor Reference Voltage Performance (Bank 1 Sensor 2)

P22AF indicates that the powertrain control module (PCM) has detected an abnormal reference voltage on the downstream oxygen sensor (Bank 1 Sensor 2) circuit. The PCM monitors the sensor's reference voltage, which should remain stable within a specific range; when the voltage falls outside that range or behaves erratically, the code is set.

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.