P0420

DTC P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (CAT)

DTC DETECTING CONDITION:
- Immediately at fault recognition (2200 cc model only)
- Two consecutive trips with fault TROUBLE SYMPTOM:
- Engine stalls.
- Idle mixture is out of specifications.





SUBARU SELECT MONITOR DISPLAY





FLOW CHART

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY and INSPECTION MODES.





WIRING DIAGRAM











PROCEDURES