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I posted this in the wrong section earlier, so I'll try it again here.
Hello everyone. At work tomorrow, I am going to work on a 6.0 diesel. I got a code P0263 and P0269. The truck runs ok when it is cold, but it runs terrible when it warms up, and it will eventually die. It sounds to me like a high pressure oil o-ring is bad, but what do you think?