P0420

DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)

DTC DETECTING CONDITION:
- Two consecutive driving cycles with fault

TROUBLE SYMPTOM:
- Engine stalls.
- Idle mixture is out of specifications.

CAUTION: After repairing or replacing the defective part, carry out the Clear Memory Mode and Inspection Mode.

Wiring Diagram:

Step 1 - 3:

Step 4 - 7:

Step 8 - 11: