2016 ISX misbehaving.

[Waterloo]

Dude, do it yourself, get a Cummins Quickserve account, it is free, enter your engine serial number and register it. You will get all of the same trouble shooting and parts information that Cummins uses. The diagrams should be there for the sensors, if not YouTube is your friend, Rawze has videos too, the link is found at the top of this page. An EGR tuneup is easy to do with some simple hand tools. If not, like Tree said, take it to haggis Automotive and Diesel Repair in Griffin GA... There is normally a 3 to 4 week wait to get in, so if I were you, time to get your hands dirty. Here is the link to Quickserve, get the ESN or EIN off of your valve cover on found on the driver side. https://quickserve.cummins.com/info/index.html