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P1625 on BMW vehicles indicates that the engine control module (ECM) has detected an electrical fault on the supply channel for the second potentiometer inside the accelerator pedal position sensor. The ECM monitors the voltage on this dedicated supply line and sets the code when the signal falls outside the expected range, which can be caused by a wiring issue, a faulty pedal sensor, or an internal ECM problem.
Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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