help please
 

hello just joined and looking for some info/help I have a 2005 f250 with a 6.0 bought it used with 130,000 on it. truck had one owner before me and is real clean. rune great the dealer I got it from did put a new turbo on it right after I got it keep getting a po299 code. that is all fixed but I have had this thing out on freeway twice now and I would say about 20 mins or so of driving wrench light comes on. I don't loose any power no check engine light, coolant and oil temp gauges show normal turbo seems to be fine. I work in a shop and have been for 15+ years but never work on anything diesel before. Any help anyone can give would be helpful. Thank you

Not to sure it could be a few things right but until you get a cel to narrow it down I would just be listing a bunch of stuff that probably won't help.