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DTC codes / P22xx · Fuel and air metering (injector circuits) / P22B3
P22B3 means the engine computer has detected an abnormally low 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 ensure the sensor's heater and signal return are functioning correctly, and a low current reading indicates a short to ground or excessive resistance in that specific circuit.
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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