Hey i used to take the cats off of my old cars remove the O2 sensor and gut the cat and replace the O2 . Is that something you can do on an Audi 2.7T? Just curious

 

Yah but if you get that done at the dealer the full flash will flash your ECU program off? How do you avoid this or do you just get your ECU reflashed after the dealer flashes it. I have been getting the cel for a misplaced o2 sensor and don't wanna have it moved. Thank you ahead of time

 

Thanks everyone for the advice. One of these days I'll know enough to return the favor.