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Q: engine codes p0171 p0174 p0325 p1000 on 1999 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
engine lights are on they told me to change the knock sensor, however the parts store gave me the egr sensor?
(1) Answer
P0171 and P0174 are lean fuel codes - P0325 is a knock sensor code. Ignore the P0325 for now, as it may be related to the fuel issue.

Look for vacuum leaks with the lean codes. Specifically - on this engine - if it's the SOHC 4.0L V6 - it is notorious for failure of the intake manifold o-ring gaskets. I would guess that the leak is there.
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