PCM Diagnostics & Tuning - Catalyst code.

My check engine light came on so I used an Autozone scan tool. It came up with two codes that both read the same, it said "catalyst below threshold bank 1."
The guy at the store said their tool can be a little vague and it could either be an oxygen sensor or a cat. Anybody have this same code before?

P0420 and P0430?

Ryan

sounds like P0420, has to do with your cats and the hydrocarbons/emissions


F

P0420 is most likely a bad drivers side cat. Cats are covered under the federal emissions warranty for 8yrs/80K. To doublecheck you can swap the rear 02's side to side and see if the code moves.

I will have to go back and get the exact numbers. If it is a cat I doubt the dealer will replace it, I know they will blame my nitrous. Thanks for the input.

Nitrous Kills cats!!

Ok, here is the exact reading. "P0420 Catalyst efficiency below threshold bank 1" This code came up twice. So if this is a bad cat then it's a total excuse to get a set of long tubes and highflow cats.

P0420 is most likely a bad drivers side cat. Cats are covered under the federal emissions warranty for 8yrs/80K. To doublecheck you can swap the rear 02's side to side and see if the code moves.

Don't jump to conclusions Blue...it could be an O2. Read above...

i have the same exact code showing up on my car right now. where are the rear o2's located?

after the cats

Happened to me right before I pulled them off to run my X-Pipe and my Longtubes...

It's normal, they don't last forever. Mine did it at 73k miles.

so if i gutted my cats and put 02 simulators on, would that pretty much solve the problem.