My 1998 Expedition MIL light is on steady, when I read the codes, I get the p401 code. I've had this to one mechanic and had new plugs put in (as the ones in there had over 150,000 miles on them), he trouble shot the egr system and replaced the DPFE, the EVR and the EGR valve itself. He also told me that there were a couple of bad plug wires. I've since changed the plug wires. The coputer was reset. The light came back on again the p401 code. Anyone have any ideas?
Thursday, December 21st, 2006 AT 11:49 PM