[RogueRider]

Bank 1 is left (driver side). I don't know how to read the freeze frame data to isolate the problem, sorry. The P0420 DTC could be the cat, O2 sensor 1 or O2 sensor 2. I had the same code and it turned out to be the cat but you'll want to make sure its not an O2. My friend owns an auto repair shop and he put the #1 and #2 O2 sensors on the diagnotic screen while we drove around (I drove, he watched the screen) to determine that the O2 sensors were functioning. The O2 sensors were not dead so we replaced the cat. Another way he troubleshoots the problem is to move the O2 sensors to the other bank and see if the DTC switches sides. Not a simple task but if you don't have a diagnotic tester to look at O2 wave forms.... PM me if you want more detail on the diagnotic waveforms.