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PO401 OBD-II trouble code
HI
2000 ranger 3.0 v6, last year engine light came on. Advance auto did code check PO401. Removed EGR valve and tube found no carbon buildup or clog so i replaced DPFE sensor and no problem for 8 or 9 months. Engine light is back on with the same PO401 code. Could use some advice on what to do next.
Thanks
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