Hey guys. Been a while since I posted on here but got a problem. My car is throwing code P0420. Did a little digging and it appears that most people get this code after swapping over to after market headers. Problem is that I haven't swapped the headers. I have an Injen intake and Tsudo N1 Catback exhaust on the car and that's it. So my question is what is possibly throwing the code? Do I need a new cat? Any insight into this would be most helpful.

 

yeah this is a cat deficiency code. nothing big. have it reset and see if it comes back on. if so we'll start from there.

 

I've had it reset already.

 

just put your new headers on. the Anti-Fouler spark plug trick should substitute the error your getting with your cat. but that is if your planning on removing the cat, unless you want to leave it broken, if it is....

 

thats just it i didnt plan on running headers.

 

Him me on aim.

 

yup no biggy, antifouler should help

 

He dosent have headers

 

^^ missed that lol, maybe a bad cat con

 

yeah if you have no header and it's give you a 420 code it ha to be a bad cat. bad o2 sensors would throw a 02 code. tough luck man. maybe it's something to do with your intake. i don't have an intake nor do i have cats haha.

 

im boosted and ive been getting this intermittently how do i do this anti fouler

 

buy one dave

 

where

 

lol - I think you're the guy that runs that website - or you're in some way affiliated.

You have 4 posts as of right now, 6:40pm EST 10/29/08 and all 4 posts were directing people to that website.

Just get yourself a vendor log-in from the admins.

 

that is a no biggy code really. i just got the same code yesterday, im completely stock no headers, i just cleared it, waiting if it comes back. this coded does not necessarely mean you have a bad cat, its more emission based.

just see if it comes back.

 

check the seals on the intake and the seals on the exhaust,also check to see if your PVC valve is loose,any of these things can cause that CEL as well,to much air getting in past the MAF sensor and the engine will toss out a code for cat failure.

 

just put my headers on and have an intake on my tc, I did the anti-fouler trick on the car but still pulled the p0420 code, when I replaced the headers I did the antifouler all at once and didn't reset the car thinking that the car wouldn't see a problem if I did it all at once, do I have to just reset it for it to go away? Thank u fellers...

 

Can I just clear up one thing here? It's hurting my head...

With the tC... it's just HEADER. Singular. Not "headers." We only have one of them.

 

^^ good catch lol

 

...........ummm the s was a typeo? I blame the keyboard! Anywho any pointers on my dramatic and climactic situation