Fault Code P0420
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0420
Catalyst System Efficiency Below Threshold (Bank 1)
Catalytic converter efficiency below threshold. Converter not cleaning exhaust gases effectively.
Part Details
Part Name
Catalytic Converter
Reference P/N (OEM)
18190-28280
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪2,000 - ₪6,000
Engine Location
Exhaust system — under vehicle, between engine and exhaust pipe
Symptoms
- Sulfur smell from exhaust
- Engine performance reduction
- Exhaust emission test failure
- Check Engine light
Possible Causes
- 1Worn catalytic converter
- 2Faulty oxygen sensor
- 3Exhaust system leak
- 4Oil/coolant entering the engine
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