I just installed my test pipe from speed circuit about 2 weeks ago and it threw a SES light I checked it with pcmscan and the code was P0420 which has something to do with the cat not performing to standards.

Has anyone else had this problem, or know what i'm doing wrong, or how to fix it?

I've been emailing Kooldino back and forth and i installed it right and everything but i don't know what to do?

 

Get a defouler (aka o2 sim). It gets the flow away from the o2 sensor and keeps it from throwing a code. I don't know a ton of companies for the evo that make them, but I know general ones. Strup, Strutking, AMS, and you could make you're own. I happen to like the angled one's however.

 

ams has a o2 bung spacer, it'll get rid of that cel for you.

 

Check out this thread. You just need the non-foulers.

https://www.evolutionm.net/forums/ev...n-foulers.html

 

The speedciruit testpipe has a built in angled O2 anti-fouler connection for the O2 sensor. I just purchased it, but waiting on the exhaust to ship w/ the testpipe. So it still throws the SES light consistently even with that anti-fouler connection?

 

Not to sound like I'm flaming you...but did you put the O2 sensor in the right place? I have this test pipe and haven't had any issues...