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Strange noises from under the bonnet? Spooky. Happy Halloween from Auto Veteran: may your only scares be costumes.
P1454 on BMW vehicles indicates that the engine control module (ECM) has detected an electrical fault in the control circuit for the secondary air injection (SAI) pump, specifically involving the series resistor that limits current to the pump motor. The ECM monitors the circuit for expected voltage or current feedback and sets this code when the signal falls outside the programmed range, pointing to an open, short, or excessive resistance in the pump, resistor, wiring, or connector.
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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