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

DTC P0420 Catalyst System Efficiency Below Threshold Bank 1: DTC Detecting Condition

Detected when two consecutive driving cycles with fault occur.
GENERAL DESCRIPTION < Ref. to DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 1 , Diagnostic Trouble Code (DTC) Detecting Criteria. >