Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!
I have a '97 4.0 that kept throwing these same codes. After replacing the entire EVAP system, fuel pump, coil pack, 02 sensors, and various other sensors to the tune of about $600, I finally replaced the computer.SHAZAM!, problem fixed, runs like new again.
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