Join Date: May 2009
Location: The Republic of Dave
P0171 can also be caused by low fuel pressure, and at times by a vacuum leak. The Bank 1 lean condition is detected by the upstream Bank 1 O2 sensor, and all it's telling you is that for one reason or another, it thinks you have too much air and/or not enough fuel in the front half of the engine. The MAF sensor - in this case, not present - may or may not have anything to do with it.
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