Usually tuners use this software to remote into a PC and help run the provided software to tune trucks... but, I wasn't aware you could tune a EcoDiesel via the OBD port.
If it started just after the fill up, you either had bad diesel or pumped gas into the truck. Otherwise that's just bad timing. If it's bad fuel the stations insurance should take care of it..
I would question your extended warranty on why it will not cover your current repair... sounds like a...
Welcome! Likely just a bad Nox sensor. Should be fine to drive until you get it back to the dealer. Emissions is something that can give problems early and quick.. just part of modern diesels.
Good info here.. and yep it's easy to change the oil. At least you know it's done right, and it saves you some money! The dealer (and even quick lubes) love to take advantage of customers because it's a "diesel".