I have looked and searched but I haven't seen this. My CEL will come on shortly after a 8 hour drive and then go out one day later (two tanks of gas). It will do this weekend after weekend. The first time it happened I had the code checked and it was P0401. I didn't think the light would go out by itself for this code, that is why I am asking. I make a 550mi trip one way and I can almost set my watch to when the light will come on and go out. This only happens on this long trip. I drive 60 miles round trip during the week and the CEL never comes on. Any ideas? MPG is staying at 21-22.
