I had my PCM read at a shop and I forgot the code it was something like P0404 or maybe P0440. The mechanic said it was the drivers side cat. Is it possible it is one (or both) of the drivers side 02 sensors is bad? Do the 02 sensors have their own trouble code?

 

each sensor should have its own code, something like low threshhold and high threshold...etc

and it will tell you which bank as well as 1 (front) or 2 (rear)

 

Mechanic said it was the bank one cat. I was hoping it was just the 02 sensors because I am also running rich... which I am guessing helped clog my new cats.