P0420

The content of this article/image reflects the changes identified in
TSB 18-98-06
Dated 01/18/06
And applies to 2005 Forester & Impreza



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.