So Ive been doing some research in regards to a cel with a code of po420. I saw that you can use a spark plug non fouler on the down pipe to eliminate a cel light with a cat code. Has anyone done this? If so does is mess witht eh air/fuel ratio? I want to attempt do this soon but curious for some more information on it! If it works id like to just run a test pipe instead of a bad cat converter which I have right now. Thanks!

 

Didn't work for me. I still have a CEL.

 

did you pull the second o2 sensor and wrap it and tuck it away? my cars inspection was up in oct ...oops..Thanks

 

yea its basically a metal house that ur o2 goes into in ur bung. ive heard it works for the second o2 but some ppl use 2 of them on 1 o2. make sure u reset ur ecu after.

 

it worked well for me.
i had no room to put it for the second O2 underneath the test pipe so I installed it on the header but switch the harness.
The first O2 is connected to the second O2 harness while the seocond O2 is connected to the first O2 harness.
got rid of my CEL.

 

Well, in one of the intergra forums it shows detailed pics of the process. I bought the 18mm non fouler pack and will drill it out this weekend. According to the pics you do all of this for the o2 sensor just b4 the cat. Now it didnt say anything aout the second o2 sensor in the pics but someone posted later that you take the second o2 sensor and wrap foil or something around the tip and tuck it away . I just want to make sure the correct process b4 trying it out. I mean, I guess its a trial and error. I do appreciate the posts tho.