Hey guys today i got a CEL for Main catalyst efficiency below threshold bank 2. Have not noticed anything sluggish on the car at all. Cleared the code and have gone through about 10 key cycles however only drove 20 miles since clearing it. What am i looking at, a new cat or a faulty o2 sensor?

 

oh and the car has just passed emissions last week..if that narrows it down any

 

Did you resolve your issue? my CEL came on and I have the same code, shop said bad catalitic converter, about 1300 USD.

Also I've seen replacement O2 sensors that send the right signal all the time, folks with track cars and no cats, used to swap them out, but can't seem to find the link.