Logging to verify a bad cat?

DSG2003Mach1

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My 2012 f150 with the 3.5 ecoboost started throwing a p0430 - bank 2 cat below threshold. I replaced the driver side rear o2 sensor yesterday and the light came back on.

truck has 113k miles, tune for about 10K miles, everything else stock

Are there pids I can watch With my X4 to get an idea if the cat is failing? Right now seems to run fine and gas mileage is in the normal ballpark.
 

DSG2003Mach1

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Watch to see if the downstream o2 sensors move around. If they do, your cat(s) are gone.

If there is an issue the substrate is not coming apart yet. The light comes and goes the last couple days, dunno if it’s possibly clogging up or what.
 

gt347mustang

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If there is an issue the substrate is not coming apart yet. The light comes and goes the last couple days, dunno if it’s possibly clogging up or what.

Lets try this again.

Watch to see if the downstream o2 sensors move around. If they do, your cat(s) are gone.
 

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