Exhaust Yellowing clear coat

Has anyone come across the truck exhaust causing clearcoat to yellow and crack? I have a 2013 and come across a few posts suggesting it may be unburnt fuel or faulty catalytic converter?

 

Any codes? I don’t see much black at all here

 

white, no clearcoat
looks like there is some touch-up paint at the line

 

Have not scanned for codes. Any advice on modules? Seems like there’s a wide variety.

 

Just looks like the paint protection film is starting to fail. You could probably just peel it and apply new film if you want.

 

the paint protection film turns yellow as it gets older. mine looks the same

 

The factory does not apply PPF behind the rear wheels. That's either PPF added by somebody ese or an area that's been touched up.

 

Is that the original sticker? Just peel it off and get a new one.

Why would you call a sticker a clear coat?

 

No clear coat on white paint.