Take the car to a different shop .... It's imppsibble the "entire" electrical system is damaged to me it sounds like a dead DME and that is replaceable there is a company called bba reman pull out "dead" electronic and have it tested by them $150 for testing
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-e24 m6
-e32 740/5
-e34 525it
-e83
-e83 Msport (gf)
-e30 325ix (gf)
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