Plug into the OBD2 with a good reader and check for codes, as some are things only noticable as a code till it goes tits up. Foxwell NT-510 or NT-520 is a great value when you have a BMW and well worth it as insurance when buying a BMW to keep the suprises to a minimum.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course