I don't know anything about Nixon Automotive, but looking at their shop pix on the website, it looks like a place where I'd take my cars. Nice big clean shop with a whole lotta Bimmers! No MB, no Porsches, no Audis, no VWs.

If you find out there was a problem that Jessel either misdiagnosed or failed to diagnose, then I think you have legit beef since you spent so much money on failed readings and a set of plugs you may not have needed. It seems to me that they charged you the price of a half-assed inspection 2 service.

Here's the BMWNA contact numbers in case you need it:
Customer Relations
BMW of North America, Inc. Corporate Office
300 Chestnut Ridge Rd.
Woodcliff Lake, NJ 07675
201-307-4000
Toll free: 1-800-831-1117
Fax: 201-930-8362

Regards, Mike