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If you go thru the Authorised BMW dealer, yes it might cost you tht much.
There are alternative though and one of it is tht you can go to The Club...
Electrical leak cud be frm anything and if you hv a PnP unit in the car, hv it check..
If not, try checking the.cables to and frm the battery .m
B10 would be better. ...
Shud join the Club as an OM and learn more abt your car and at the same time meet new friends ...Bimmer Brotherhood ..