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.