July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

DTC P0420, P0430: Catalyst System Efficiency Below Threshold (Bank 1)/(Bank 2): Notes

HINT:

If DTC P0420 is displayed, check the bank 1 catalyst.
If DTC P0430 is displayed, check the bank 2 catalyst.
Bank 1 includes cylinder No. 1, but bank 2 does not. Cylinder No. 1 is located in the front part of the engine, opposite the transmission.