I just bought a Greddy 4-2-1 Header for my 99 hatch and the check engine light came on. I was wondering if anyone would be willing to help me out with a solution. Turning the light off is cool but I know its going to keep coming back, so if anyone could help me out I would appreciate it. Thanks!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civicsi21 &raquo;</TD></TR><TR><TD CLASS="quote">I just bought a Greddy 4-2-1 Header for my 99 hatch and the check engine light came on. I was wondering if anyone would be willing to help me out with a solution. Turning the light off is cool but I know its going to keep coming back, so if anyone could help me out I would appreciate it. Thanks!</TD></TR></TABLE>

You probably don't have one of the 02 sensors plugged up because you removed the cat which was part of the stock exhaust manifold which you took out to put the header on.

 

Thanks for the info. There are two o2 sensors, one before the cat and one after. Both are plugged up but I was thinking that maybe I need a new o2 sensor?

 

My guess is that your second o2 sensor is throwing the code. Its there to tell you if your cat is failing or w/e, and since you have no cat, its going to throw the code

 

not tryin to be a smart *** but have you checked the code?

 

No I haven't. It's kinda sad that im asking this but how do I go about doing that?

 

Sorry guys call me a dumbass but the first car I had was a e36 m3 and I wouldve liked to do most of the work but I sent it to Dinan in FL and they pretty much took over so I dont have a lot of hands on experience. I did do my b16a2 swap and everything else mechanical.

 

http://www.c-speedracing.com/faq/06.php

and then

http://www.c-speedracing.com/faq/05.php

 

Hey thanks a lot man I appreciate the help!