I have a 1990 740 turbo wagon, recent work includes new clutch and clutch cylinder and replaced tranny (with used M46).
My wife had the car the other evening, and as she was accelerating to pass another car (highway speed), she noticed that the car was acting as if the transmission had dropped out of gear (although she was in OD and the OD light did not go out) and the check engine light came on.
She took it to a garage the next day to have it checked and the mechanic recommended that we replace the crank position sensor based on the following OBD codes:
2-1-4 crank shaft position sensor fault
1-3-1 ignition system RPM signal
2-3-1 Lambda sono not operating
Does this sound right? Based on what I have read in the FAQ, a faulty crank sensor is associated with a no start condition, which is not the case here.
FWIW, the mechanic cleared the light, and the same thing happened on her drive home.
Any insight would be appreciated.
Thanks.
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