If this is for the e46 325i listed in the car list, I suggest getting a Windows laptop and a K+DCAN cable (with a switch on it) and running diagnostics on your own at home.
Also a replacement DME for that car can be done quite cheap while keeping all the vehicle programming and security intact.
Personally I doubt it's a DME issue, but it could be.
It could also be other issues, so I always suggest a good independent shop, or doing some home diagnostics.
My bet is that I could get that car to scan just fine. Dealers are so used to the newer cars that they're essentially clueless or blind to the simple things of the old cars.
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-2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs.
-2019 M2 Competition MT, Alpine White. Self-tuned 560hp
-2016 Mini Cooper S, MT. Many plans.
Others:
-E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe.
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