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Old 11-15-2012, 06:33 AM   #9
Registered User
Join Date: Mar 2008
Location: OC
Posts: 282
My Ride: 2005 M3
My guess if the car just shut off mysteriously and there are no dash lights, I say crank angle sensor. If it is loose, has compromised wiring, perhaps a bad connector or it just might have flat gave up the ghost (meaning the sensor is dead), this would cause an otherwise normal operating car to be rendered helpless on the roadside. This hit or miss method of diagnosing a car is terrible without a diagnostic scanning tool to see what kind of DTCs are stored in the ECU, and what is going on when the car is powered up (meaning key in ignition switch turned clockwise just short of engaging the starter). if you have the wherewithal, and most M owners do, call AAA, and have it flat bed transported to your trusted mechanic.
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