How many miles on your car? Mine did this several times however it was simply Coils and/or spark plugs. Oh yeah, and the HPFP went bad. And the fuel injectors are horrible.
Basically the N63 is a horrible designed engine. The issues are countless really hence the extensive Service Bulletin list of items they will replace for free. Take it to the dealer , see the Drivetrain Malfunction points to as far as what code pops up. My guess is good are yours as but lets just hope it's one of the culprits on the bmw bulletin.
Other than that what other symptoms or issues have you run in to?
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