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DTC codes / P22xx · Fuel and air metering (injector circuits) / P2255
P2255 means the engine computer has detected that the heater control circuit for the upstream oxygen sensor on bank 2 is drawing too little current, which usually indicates an open circuit or high resistance in the sensor heater or its wiring. The computer monitors the current flow through the sensor's heater element and sets this code when the negative-side control circuit reports a low current condition.
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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