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I'm not quite understanding what I'm looking at, but impressed my OBD2 app offers the option to see this. It took some digging. From what I can tell Bank 1 sensor 2 (post cat) is saying there is too much variation? I don't see where it's much off from Bank 2 sensor 2.

 

Are you using the OBDII scanner? It appears that you have a catalytic converter issue, assuming the O2 sensors are working OK or have been replaced recently.