i put a skunk 2 cat back exhaust on my 08 civic si and it threw a check engine light. how do i fix this?

 

it depends on what you CEL code is...its prolly the rear 02 sensor...you may or may not need a defouler to sit the 02 sensor a little bit farther back so it can get less of a reading...may or may not. check the code first.

 

Flash Pro.

 

That's kind of weird. I haven't really heard of a CEL from just a cat-back install since there aren't any sensors after the secondary o2 at the end of the stock cat...did you take the cat out?

 

check the cel code with a code reader, or unplug your battery and plug it back in lol