I have 150 miles on the truck and the service engine light is on. I don't have time to take it in till Friday and the engine seems to be operating fine. Any ideas what it could be? With the poorly aligned body panels and rust showing up everywhere on the underside, makes me wonder if buying a Ford was a good decision. I just want to be happy about my purchase. Jeez, was mine inspected on a Friday? Damn UAW. Sorry, I'm just bitching. At least I don't have the clunk...........yet. Do you think undercoating the rear fender wells and underside of the bed is worth it? I live in western Washington. The first "American" car I've purchased and it's giving me stress.