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DTC codes / P22xx · Fuel and air metering (injector circuits) / P22AD

P22ADO2 Sensor Positive Current Control Circuit High (Bank 1 Sensor 2)

P22AD indicates that the powertrain control module (PCM) has detected an abnormally high current on the positive control circuit for the downstream oxygen sensor (Bank 1 Sensor 2). The PCM monitors this circuit to ensure the sensor's heater and signal return are functioning within specifications, and a high current reading suggests a short to voltage or a faulty sensor.

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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage