DTC P0420 Or P0430: Catalyst System: Notes
- DTC P0420 = Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0430 = Catalyst System Efficiency Below Threshold (Bank 2)
NOTE:
Bank No. 1 refers to bank that includes cylinder No. 1. Bank No. 2 refers to bank without cylinder No. 1. Sensor No. 1 refers to sensor closest to engine block. Sensor No. 2 refers to sensor farthest away from engine block.