Engine code P0420!!!!?

My truck is pending a code P0420. Anybody know what that code is for or how to find out what this code is?

 

it a cat code.

are you running an o2 sim with the DTLT headers?

google is your friend

http://www.obd-codes.com/p0420

Justin

 

awesome thanks man. no not running a sim but I put a system on it the raised it off the pipe so it wouldnt read the same. I wonder if i take it out and clean it if it will go away.the light hasnt come on yet buy my ultragauge told me it was pending

 

that just means its stored. It came on and went off at some point.

clear it with the UG and see if it comes back.

you can always put a sim in and never have that problem.

Justin

 

ahhh I see thanks for informing me. so if I clear it with the UG it will come back eventually? It doesn't cancel it for good?

 

I don't think so. If there is a problem you'll probably get codes again.