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Q: what would cause codes p0171 and code 404 on my pontiac aztek on 2001 Pontiac Aztek

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after changing the acm sensor,gas cap, and purge valve,also changed the plugs and wires
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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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