Quote:
Originally Posted by green03
Mine's an '03 with 50k miles. I have a rough idle, cel on with trouble codes P0171 and P0174. I have replaced the MAF to no avail. Any insight?
Thanks
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I just ran into the same codes on my Expedition. In my case it was cause by a vacuum leak between the PCV valve and the throttle body. I'd check for vacuum leaks before spending a bunch of money on sensors. It's unlikely both sensors are bad.