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you are right i do not have an o2 sensor after the cat in the cs exhaust, but neither did the stock exhaust. so my question is how would it know that there is a problem when there was never a o2 sensor after the cat in the old exhaust or new one to monitor air flow. when i removed the old...

stock has 2 right? and both are welded to the the stock exhaust right? if thats the case i have one high flow cat and its on the cs exhaust and was welded on by cs.

well actually i got the cai installed a few months before the exhaust. The cel came on a few days before i installed the exhaust, so thats another reason i was thinking it was the o2 sensor. it isnt a big deal to have the cel on but i would like to get it fixed at some point

ok so my cel came on a few months ago finally got it read and its P0420. i have a corksport exhaust with a highflow cat and an injen cai. after reading some of the other posts about the cel p0420 most of you think its uasually the o2 sensor so thats what im assuming is wrong. Just wondering...