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DTC codes / P22xx · Fuel and air metering (injector circuits) / P2252
P2252 means the engine computer has detected that the negative current control circuit for the upstream oxygen sensor on bank 1 is reading lower than expected, which typically indicates a short to ground or an open circuit in that control wire. The computer uses this circuit to precisely manage the sensor's heater and signal return, so a low voltage on the control side prevents accurate air-fuel ratio feedback.
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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