Hey guys, I got the 6-7 blinking CEL, so I figured the Cat is finished.

I got another cat from "dnice" here on the forum (thx by the way).

I plan on removing mine, and replacing it with the one I bought, so I bought a new gasket(that goes between the cat and the exhaust) from the dealer, but I totally forgot to order the gasket that goes between the header and the Cat!! Can I just re-use the one that's already on the car?? Or do I absolutely need to buy a new gasket that boes between the header and the cat??

Thx

Nick

 

You're talking about the donut gasket.
Its made of some carbon/fibreglass composit (that is what it looks like anyway) and it allows for some movement between the exhaust header and the cat & rest of the exhaust.
This is also why there are spring loaded bolts between the cat & header.
The donut gasket is not a "you-have-to-replace-it-everytime" gasket but you won't know its condition before removing the cat.
It can deteriorate a bit over time.

I'm guessing this is not the answer you're looking for

Btw.. how do you figure the cat is gone?
Do you know the actual CEL code?

 

I got the P0402 code

 

P0402 = Exhaust Gas Recirculation Flow Excessive Detected
As far as I know the S2000 doesn't have an exhaust gas recirculation system.

P0420 = Catalyst System Efficiency Below Threshold (Bank 1)

Do you have this one?

 

Oooops yup that's the one . 0420

 

Reuse it.

 

Yep, reuse the donut gasket... I've taken off and reinstall my exhaust numberous of times without having to replace that gasket.