After reading all of these, and other posts of a similar nature, I am wondering why you are pointing to the MAF when it's only a P0171 code. I've been getting P0171 ONLY, never P0174. The MAF is common to both banks, yes? The only things I don't see as being common to both banks are the injectors and a possible intake/exhaust leak.
Is it possible to get P0171 without P0174 ever appearing, and have a defective MAF?
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