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Q: Power module malfunction warning, engine unresponsive

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I've recently purchased this used car and I'm having many problems with it. It wouldn't crank at all. The engine lost power. The dashboard shows lights blinking and there is a power module malfunction warning. Is the engine going out?

Hello there. This is not an uncommon fault with a BMW 745Li. With any complex electrical system, the first thing to do is the perform a load test on the battery, as proper voltage is important for how the entire system works. Other possible faults include the alternator, battery cable, MAF, oxygen sensor or a wiring issue. Have a qualified technician, such as one from YourMechanic, diagnose the loss of power and perform any repairs required.

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