Most shops are going to charge diagnostic. Usually you can apply the money charged for the diagnostic towards the actual repair.

It may be a little drive, but I would highly recommend The Premier Los Angeles BMW MINI Service and Repair Center.

You also might try listing your specs and issue. You might get some free diagnostic info from the forum.

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2002 X5 4.6 Sold
Dinan CAI, TB, Mass Air, Stage 4 engine & tranny software, X-pipe
2004 745Li
1997 Ford Mustang Cobra Vert
1985 Mazda RX-7
13B-REW single turbo 60-1, Haltech, Meth injection, MSD Ignition, and much more
2008 Mazda Speed3 Hypertech Tune