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DTC codes / P22xx · Fuel and air metering (injector circuits) / P2254
P2254 indicates that the powertrain control module (PCM) has detected an open or excessive resistance in the negative current control circuit for the upstream oxygen sensor on bank 2. This circuit is used by the PCM to precisely control the sensor's heater current or pumping current, and an open circuit prevents proper sensor operation and closed-loop fuel control.
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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