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I have a 2014 335 with 9k miles and just had the turbocharger replaced. I got the "drivetrain malfunction" warning, and brought it in to the dealer. The car sat for a week while the engineers and the dealership decided whether it needed a new turbo. Had a loaner car for the week but was disappointed with the time it took. I don't drive the car hard, just daily commute to work.
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