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

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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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