Or even better, have that mechanic buy that $1200 module, tell him that f it doesn't solve your problems 100% that you are not paying for it. If the mechanic is going to guess at his job, instead of careful diagnosis, let him guess with his money, not yours.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2