I have code p0421. The PO showed me the receipt for the replacement of the 02 sensor. But I did not see which one bank one or two. I assume both were replaced. So I am think the cat is the issue. What are my options to replace the cats? 1000 to 1200 per side sux for Oem when a high flow set is only a few hundred more.

 

I might consider this if the price is right. But I can’t find where to send a pm. I only see vm.

 

Check your PCV & check valve as well. If they are torn, your oil consumption will be pretty high. This excessive mist of oil makes the CATs' job that much harder too. Relatively cheap and easy to check. Swapped mine out and went from a quart every 1,500-2k miles to 5k+ and no oil consumption.