Question about 2004 Isuzu Ascender
P0171 is a fuel trim system lean (bank 1) trouble code, and it can be caused by an air or vacuum leak between the MAF (mass air flow sensor) and the throttle body, or a vacuum leak somewhere else, be sure to check all the vacuum lines and make sure all of the clamps are tight in the air induction system, especially between the MAF and the throttle body.
Posted on Apr 22, 2010
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Posted on Jan 02, 2017
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