I'm getting all of the same messages.

Check Exhaust System
Poor fluid quality

I went to the Dealer and they charged me $180. Said they reprogrammed the computer....

It lasted for about a week, and now all of the warning signs are appearing again.

2011 - 3500 HD with 26,000 miles.

Just six months past the 36 month warranty. WTF. Does anybody else have a better solution?