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DTC codes / P01xx · Fuel and air metering / P0125
P0125 means the engine computer (ECM) has not seen the coolant temperature rise enough to enter closed-loop fuel control within the time or distance it expects after a cold start. The ECM is comparing coolant temperature sensor readings against a modeled warm-up curve, and the engine is staying in open-loop fuel control far too long.
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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