I Put on a used but low mileage oem cat with o2 sensor, plugged it in to stock plug all good. But on a brand new dc sport full catback exaust. Everything went smooth only thing was my old cat and exaust was rusted togethr so I took it all off in one piece so I wasn't sure if there was a gasket that goes from the cat to the pipe. The cat going to the headers was nice and smooth didn't look like a gasket ever went there. Everything sounds great nice deep low sound. The once problem is the check engine light is now on. I did fire up the care when I had the exaust off just to see how loud it was but only for a few secs. So is there something I need to reset to take that light off and is there a gasket that goes from pipe to stock oem cat. The guy at the place I bough it from said it didn't come with one. Thx for any help.

 

Did you pull the code? What is your make and model?

#20 18229-S01-X11 GASKET, EX. FLEXIBLE
#25 18393-SH3-S00 GASKET, PRE CHAMBER (52.5MM-53.5MM)

 

Well I need to order a gasket on eBay because it doesn't have one right now On the 25 part. So do I need to order a 53mm on eBay? As far as the code goes I have no idea were I would pull that. It's a 2000 civic si.

 

Either stop by Autozone to get them to pull the code or do it manually here:
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/how-pull-cel-d4-srs-abs-codes-code-lists-1901557/

Just get the gasket for 99-00 Civic Si. I mean they're only 7-8 dollars from Honda you might as well get it there or Autozone/Advance are going to be the same range.

 

Is this the correct gasket for the 25 part?
http://cgi.ebay.com/ebaymotors/ws/eB...ht_3427wt_1008

I also have a dc sport header coming in the mail I'm guessing they dont come with a ring or gasket at the bottom end?I already ordered a new header gasket for them.

 

Ok so autozone will have the gaskets cool.

 

Pull the CEL codes, and then reset the ECU to see whether the code(s) repeat.