Matts99SS

Found both bank one and bank two po420 codes. I found on Amazon what is called a o2sensor extension. $9.95 each. It's a sleeve that goes over the o2sensor and screws into the exhaust where the o2sensor goes. No modifications. It gets the o2sensor out of the exhaust gases but still shows it's working to the ecm. No more codes. And no $1000 cat 😀

2fast97Z

iTrader: (20)

Those do not always work, never seen them used on an Fbody. Anyways a cheaper way then buying new cats is to get the car tuned and tune the codes out like you do with catless longtubes anyways.