The first thing they did was put a new sensor in it. (in the mirror). I can live with the -40 as it does go away sometimes, but the check engine light because of it is annoying.
Wish there was a way to disable it. Bugging the dealer to swap me a good truck or going to run his name thru the dirt. 12 times in the shop is enough id say. Especially as its my 10th vehicle from them!

 

They should have put in a request with their zone rep for a tech advisor to come out. That's way too may times. Check your PM too.