To start off, I tried searching for this but was unable to find a solution so I apologize in advance if im reposting ona warn out topic.

My problem is that I just installed a cat delete from ATP and now im throwing a P0420 code. The fact that I removed the cat which resulted in a cat related trouble code doesnt really surprise me. Its the fact that I havent really heard about it before. I have read on numerous posts saying nothing but good things about the cat delete, and havent seen anything talking about problems associated with it.

Now on to my next question... What is the correct way to fix the problem? I have read up on some posts that moving the rear sensor back "might" fix the problem, but I havent heard this is a for sure thing. So I dont want to be cutting up my new Borla exhaust that coming in next week for something that "might" fix it.

Other then that, I haven't found any other possible fixes. So please, if anyone has a good way of fixing this problem, without having to re-install my cat, please let me know.

this trick will help you, worked great for me
http://forums.vwvortex.com/zerothrea...095&page=1

you need to do the non fouler mod to it

Wow, simple enough...Thankyou.

So since we are on the subject, how did it get the name non fouler anyway?

becasue the things most people use are really spark plug nonfoulers