Rattling my cage

Anybody else got info on these P0420 descriptions and/or subcodes that tell the tech what the actual problem is?

 

Bank 1 Sensor 1 Bank 2 Sensor 2 Lean/Rich It's not rocket science, it's a simple DTC with description.

 

I won't mind if you feel like screenshotting Techstream displaying a P0420 that way, but I also won't mind waiting for somebody else.

 

There's always Google images that show this, if you're just generally interested. I know, it's not the service manual PDF so it might be hard to believe.