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What would cause codes p0171 and code 404 on my pontiac aztek

(2001 Pontiac Aztek)
in Crystal Lake, IL on September 07, 2012
after changing the acm sensor,gas cap, and purge valve,also changed the plugs and wires
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Popular Answer
on September 07, 2012
Code p0171 is usually caused by a vacuum leak somewhere on bank 1. Check gaskets, seals, and especially vacuum hoses for damage to cause this problem.
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