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Not sure if you've found an answer yet on the "drivetrain malfunction" message, but the same thing happened to me ('19 330 wagon) after an oil change. The mechanic said it was bad gas.. I ran 93 for a month, no change. Brought it to a Tulley BMW and it ended up being rodent damage to my engine harness which triggered a sensor. Comprehensive insurance covered it ($3000) and we're good as new.
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