Well I replaced the glowplugs,relays, valve cover gaskets, internal wiring harness', and injectors in my 7.3 over the weekend. After 212,000 miles it was time for it, it runs like a new truck! Anyways it is showing a check engine light and the scanner says the light isnt illuminated. Anyone have any ideas?

 

Have you tried turning on the headlights then disconnecting the batteries for a few mins. to reset the computer ?

 

What are you scanning it with? Only the high end scanners (Snap-on, Rotunda, etc) and ones loaded specifically with the diesel programs will pull codes. My AutoXray scantool has never pulled a code from my truck, but Mike/Joe's superchip programmer will.