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DTC codes / P22xx · Fuel and air metering (injector circuits) / P22B4
P22B4 means the engine computer has detected an abnormally high current on the negative control circuit for the downstream oxygen sensor on bank 1, which is the sensor after the catalytic converter. The computer monitors this circuit to precisely control the sensor heater and signal return, and a high current reading indicates a short to voltage or a fault inside the sensor or wiring.
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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