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A code reader will steer you in the right direction, but won't perform the diagnosis. You'll need to be able to read the adaptation values to get close to determining if the AMM is shot. Steve Brotherton has some terrific posts on this, do a search. High adaptation values (max at 1.32) indicate the AAM is probably bad. Low values (lean) indicate other fuel problems, since the system is compensating for a lean burn, not rich as a bad Air Mass Meter indicates.
Find the codes, and then begin to find the cause for the codes.
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