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I will just add, I was driving the other day, a P094D code popped up for the first time with a NOx insufficiency. The light came on a few days after I finished a 600 mile trip towing 10k. When I get back to Louisiana I think I will pull the egr system off and see how serviceable it is. It went away after a 70 mile round trip up to some mountain property, unloaded. 

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@That GuyLOl, I have the same dyslexic issue, from time to time. I would say that sounds like the EGR valve needs cleaning... Did it get the 67,400 mile EGR service that is recommended?  If not, there is pretty good video on youtube for it. The host name for the video is motorcitymechanic.

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