Intermitent Derate alarm

[BDiscovery]

Thanks again for the response. I'm sure you are right, I bought this truck about a year ago and it's been a money pit. I really doubt any PMs to the emissions system have been done. Seems like every time a "certified mechanic" fixes it I have to follow up and fix it again. I had people telling me to delete it and that is what let me to your site. I watched your egr tune up videos and decided not to delete the truck rather fix and or maintain the emissions system.

I cooked the dpf and doc, pulled the sensors and checked for soot and changed the doser injector. Hardly any soot on the sensor and no indications of a leaking egr cooler. I was going to replace the sensors and clean all the egr parts on the next trip, may have bit me in the ass.

Thanks again for all the advice and feedback.

Brian