Without taking the car to a dealer, is there info somewhere about the control units, how many, what each one does? The machanic says that it may need one or more computers / control units. I know that new ones are expensive.How many Control Units are in a 1990 7-Series BMW?Hmmm, too many, yes they are computer controlled and once they go screwy it could cause a very Ghost In The Machine.
Electrical Diagnoses -must- be done right if he has the specific scan tool, you can go from there.
EBay will solve all your ECU problems and things.How many Control Units are in a 1990 7-Series BMW?It would not help you at all if I tell you how many assuming that my crystal ball can tell me what kind of 1990 7 series you have since there are several variants. BMW does not only make your type of car dude, it makes several different models within the same 7 series.
Why not just have it diagnosed first by a reputable, knowledgeable, well-equipped, and experienced BMW shop or technician ? Then take it from there. Many answerers in this forum can help you after you have had it diagnosed, and not before.
Saying and worrying that it may need one or several control modules, or sensors, or actuators is uncalled for at this point. Same with the prices/cost and sources.
You don't count your organs when you go to a doctor do you?How many Control Units are in a 1990 7-Series BMW?I think its 12.
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