I'm trying to chase down a post-cat fuel trim issue P1193(bank2), did everything i can think of (new O2s, CCV, intake boot, DISA). I can use a new MAF, car is 110k old, 530i, but I can't reason why bad MAF will only affect bank 2, not bank 1.
Will bad MAF cause fuel trim code on only 1 bank?
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