DTC codes / P22xx · Fuel and air metering (injector circuits) / P22AB
P22AB indicates that the engine control module (ECM) has detected an open circuit or abnormal current flow in the positive current control circuit for the downstream oxygen sensor on bank 1, which is the sensor after the catalytic converter. This circuit is used by the ECM to precisely control the sensor's heating and pumping current, and an open circuit prevents proper feedback, often triggering the check engine light.
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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