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i was having the "DRIVETRAIN MALFUNCTION" message since last year. it was happening to me while I drive in sport in the highway and I felt the car get heavy and the message will come on.
I took it to the mechanic and it happened to be the Turbo Solenoid that was getting confused telling the computer high pressure/ low pressure at the same time.
try that.
One thing that happened to me was that I turned off the car and when I took it to the mechanic they couldn't find the message or the problem. Make sure that when you get the message try to get it scanned when the message is on, because it you turn off the car they wont be able to find it.
good luck.
PS: my car is a 2013 535I.
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13'- F10--> Work in progress: V-Style front lip, HAMANN roof spoiler, M5 grill, high kick trunk spoiler, H&R sport springs, C-quence Drilled front rotors, VRSF Catless DP, VRSF charge pipe.
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