Got the engine light and the cat codes. Using my ole Zurich zr11 . My stft B1 and B2 is below 10 percent at idle and 1500 and 2500. It bounces from 0.0.to 7.0 percent mayb once during acceleration it got up to 9.0 percent but came back down. And that was only B1.
My Ltft at idle and 1500 and 2500 on B1 is 1.8 percent and holding and B2 . 08.0 percent and holding. So are my kitties bad ? Any ideas. I say no. But at best im a shade tree DIY'r

 

Guess no one understood what I am asking. But after doing more digging. Found that i can test the temperature at the inlet of the cat and at the outlet of the cat , to determine if they are bad. Hope this helps someone else.