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Forum: 4.0 SOHC / 4.0 OHV Tech 11-10-2012, 05:43 PM
Replies: 116
Views: 153,928
Posted By cchrst310
Question Re: If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!

My 03 FX4 4.0L V6 has thrown the same codes. I found the vacuum hose under the upper coolent hose had a huge hole in it. Changed that ,then got the Check engine lite with same codes again. Changed...
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