I`ve been checking old post`s trying to get information about this code and find different answers. First let me explain what I`ve been doing. My truck a 04 F-250 6.0 manufactuered date 11/03 was shutting down and giving white/blue smoke. would run perfectly setting still in netural. I was getting trouble codes 404, 488,611,334,335, On my Edge programer. I couldn`t drive around the block with out it shutting down. Yesterday I cleaned the EGR valve and it seems to be running great now. I`ve only driven about 40 miles but it seems to have more power. I checked the codes after the drive and now get the 488 and P1334. Please help me understand. Also when I cleaned the EGR valve the valve was stuck, it wouldnt move hardly at all. cleaned it and then sprayed it with silicone and finaly got it to move. I then cleaned it again with carb. cleaner. Does the 488 code apply to my truck?