U5/Low Emissions Models

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 repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode.

Step 1 - 3: