My CEL has been on and off, I finally got the codes read while it was on and received the P0420 error. I have read about this on the forum, and it looks like I am going to have to replace the cat.

I was just about to sell this car! The dealership wants $1100 just for the part (rosenthal).

Here is my question:
Is there anything else it could be that is causing this code?
Whats the cheapest cat available that I can put on this car and will not receive a CEL?

Thanks,
Matt

EDIT: I have 85,000 miles so it is not covered under warranty right?

 

http://www.epa.gov/oms/consumer/warr95fs.txt

80,000 miles is when the warrenty for the cat expired

 

Yes, I just got off the phone with Mazda North America and they confirmed that. They are going to talk to the dealership and see what they can do. My argument with them is that there was a voluntary Emission Recall back in August of 2006 (4206F) that stated the catalytic converter may be degraded in some vehicles. My car was serviced for this recall but the cat was not replaced.

I refuse to spend $1100 on a cat. Ridiculous.
So if Mazda won't cover it then I need some recommendations on a inexpensive aftermarket solution that will not cause a CEL or emission problems.

Matt

 

Rotary Power Supercat = high flow cat.

Forum members have reported no CEL and will pass emissions.

 

Do you know if this is just a bolt on? Does it use the existing resonator or replace it?

 

Here's the link: http://www.rx7.com/store/rx8/rx8exhaust.html

Direct bolt on FWIW.

 

The supercat is a direct bolt on replacement and it gave me 6WHP and 4.5TQ. It has held up great for the past 2 years and that includes track days

 

Awesome, I have access to a lift so it should be pretty easy to install. So does this replace the resonator then or does it bolt onto it?

 

I would still try to get the dealership to replace it under warranty but if you can't, the RP is a great alternative.

I have it on my car and it's awesome

 

So mazda north america and the dealership said there is nothing they can do. So I guess I am going to buy the RP supercat and hope that i fixes the CEL. I wil be pretty upset if it doesn't

 

be sure to reset your ecu once you get it installed. A CEL might appear at first. If it persists, take your car down to an autozone or pepboys and have them read the CEL - then come back on here w/the code.

 

Ok. Will do. From what I have read though it sounds like the RP supercat shouldn't throw any CEL's. I honestly would have just driven it with the CEL, I could careless if the CAT is hollow or not, but I am getting ready to sell it and it needs to pass emissions. I was looking at buying a new mazda but I'm not sure what I am going to do now after this whole experience.

The worst part is that the new owner is going to get to enjoy this new RP supercat....I might have to keep my 8 for another month or so now

 

Oh man that sucks - i really like the RP supercat. try and get as much time with it as you can.

 

Why don't you try and find a used stock one?

It will certainly be cheaper than what you are gonna spend on the Supercat.

 

yea. i have a 7k mile used stock cat thats in perfect condition for 250 shipped... much cheaper than your current option and will be stock..

 

^ that was going to be my suggestions. Find a used OEM cat and just throw it on there.

 

hey man u still have the cat for sale thanks tony

 

concidering that was too years ago and the member is banned from this site since then. NO