Bad O2, A/F or CAT?

I keep getting code P0420 and P0430.

Using Torque Pro I ran a 02 test. Vehicle was fully warmed up. Test at idle.

First screen shot is of Bank 1 Sensor 2. The pattern basically stays the same if I let it run.



Second screen shot is of Bank 2 Sensor 2. Again... the pattern stays the same if I let it run.



To me B1S1 looks pretty good, B2S2 looks like it has a real problem.

It's probably pretty obvious by now I am not all that familiar with Torque Pro or the information it provides. My assumption is both these sensors are the O2's coming just after the CAT.

I also took a laser temp reading at both ends of the header cats...

Passenger Side
Entry: 485
Exit: 490

Driver Side
Entry: 480
Exit: 530

My question is does it look like I have a bad O2 sensor or bad CAT? Or both?

Replace both CAT's and both O2's... or just the bad ones?

Thanks for any ideas or input.

 

Catalytic Converters are not cheap and if you replace one w/o fixing what killed it, you'll end up replacing it again sooner than you might like.
I know it's easier said than done, but I'd find a legit independent shop and see what they have to say.

xxS1 sensors are upstream A/F before CAT - xxS2 sensors are downstream O2 after CAT

 

I had this not to long ago. Replace all four O2s. Fixed my issue . Replaced all of them for peace of mind anyway and if that didn't work it points to the CAT which around certain mileage could start to fail . Your going to replace your sensors with new CATS. Take the east step first .