P0430 Error Code

My 97' Tahoe is getting an error code of P0430 and I have already replaced bank 2's oxygen sensors. Does anyone know what else could cause this code?

Thanks.

Ernie Blankenship

I dont have the book in front of me, but I believe the P0430(and also P0420 for the other bank) are Catalyst system efficiency below threshold. I had this code a while back. You have a bad catalytic converter. There is a 8year/80000 emissions warranty that is mandated by federal law. If you have under 80000 miles on the truck, you should be able to get it replaced for free.

Thanks alot for the information. I'm outsife the warranty period.

Thanks again.

Ernie Blankenship