BMW 3 Series Wont Start — Dead 12V Battery After Standing
BMW 3 Series failing to start after standing for several days indicates a parasitic battery drain or a battery at end of life. Multiple control modules remaining active is the most common cause on E90/F30. Battery voltage below 11.8V will not start the car. Test battery with a load tester before replacing. A new AGM battery (required on all modern BMWs) costs £120-200.
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