Well the only real mod on my s2k is the j's racing exhaust with berks test pipe so i guess that my problem i haven't had a chance ima hit up autozone to check it out i turned off the car off and on and still check engine light on

 

it could be if you don't have a o2 simulator?

 

happened to me

 

What year is the car? 06+ are common to throw a CEL from a TP even with Berk's TP.

 

04 here catalac efficiency so i guess its the test tipe?

 

yea just buy one of those cel fixes on ebay for like $20 i think ive had mine for about two years now and no problem just disconnect the negative terminal before so the car can reset it self and should fix the problem, hope this helps you out

 

you can get spark plug no foulers from a parts store for dirty cheap, pulls the o2 away from the exhaust stream and usualy fixes the CEL. Just be sure to get one that is the same thread size as your o2.