testing catalytic convertor function with Durmatric

[sjeppell]

I have a 2009 Cayenne base model with the V6.  I'm throwing a P1073 fault.  I did a smoke check of the exhaust system and found a leak that I've plugged.  I replaced the bank 2 downstream O2 sensor with a Bosch OEM part but the fault has come back.  I have a Durametric Enthusiast Edition and would like to test out the cat. performance with that as much as possible.  My problem is that there are very few options in the live sensor tracking that have labels that clearly read like: value X before Cat. bank 2, value X after Cat. bank 2.  So, I'm looking for a little coaching regarding what values I should be comparing to assess cat. function.  

[JFP in PA]

You should be comparing the voltages for the O2 sensor ahead of the TWC to those after the TWC:

 

The voltage curve for the senor after the TWC should be a relatively straight line, the one ahead the should be a sine wave like pulse; if the voltage curves are both sine waves, the cat is toast.............