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DTC codes / P22xx · Fuel and air metering (injector circuits) / P22C1
P22C1 indicates that the powertrain control module has detected an abnormally high current on the negative control circuit for the downstream oxygen sensor on bank 2, which is the side of the engine that does not contain cylinder number one. The sensor's heater or signal return circuit is drawing more current than expected, often due to 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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