DTC codes / P22xx · Fuel and air metering (injector circuits) / P22AD
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.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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