Both banks this time....

I just got bank 1 replaced a few months ago and now both are bad. What could be causing it? It's the stock exhaust with a lid.

It's under factory warranty, but will the dealer give me crap because of the lid?

 

I had both of my cats replaced a few year ago. All under warranty. Apparently, there was a bad batch that affected some 1999 and 2000 models. That fact that you had one replaced recently is troubling. Chenck into the cat warranty. GM may warranty them as much as 8 years. That info I got from a Chevy service writer. It may actually be true.

 

If you are running really rich for awhile it can clog the cats. But no matter what you should be ok because all cats are under warranty by the goverment for 7 years.

 

Cats are covered under the emissions warranty for 8 yrs/80K in the U.S. Don't understand why the "new" one went bad already. You'll be fine with the lid. Did you get both DTC codes? 0420 and 0430?

 

Don't remember the exact code, but it was 2 and each was one of the banks. 0420 sounds right.