It came back on on my drive to work this morning...
It's code P0430. The code reads "Catalyst System Efficiency Below Threshold Bank 2."
I also had the Bank 1 code come on, but it wasn't permanent and I have that cleared now. No more CEL, but the permanent code
did come back after just over a week of non-aggressive driving.
Does this mean I should try that ECU reset thing and see if that fixes it?