P0420

DTC P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD





SUBARU SELECT MONITOR DISPLAY

DTC DETECTING CONDITION
- Immediately at fault recognition (2200 cc all states except California model only)
- Two consecutive trips with fault

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

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





WIRING DIAGRAM (LHD)





WIRING DIAGRAM (RHD)











PROCEDURES