P0430Medium urgency
Catalyst System Efficiency Below Threshold (Bank 2)
Emission · Catalytic Converter
⚠️ Safe to drive short-term — fix within 2 weeks.
What this means
Same as P0420 but affects Bank 2 (passenger side on V6/V8 engines). The downstream O2 sensor reports the catalytic converter is not reducing emissions adequately.
Likely causes
- Worn catalytic converter Bank 2Most common
- Faulty downstream O2 sensorCommon
- Exhaust leak Bank 2Less common
Estimated repair cost
O2 sensor replacement$120 – $300
Catalytic converter (aftermarket)$400 – $900
Catalytic converter (OEM)$800 – $2,200
🏪
Sponsored · Local Shop
Find shops near you specializing in this repair
Get quotes from certified mechanics · Free estimates
📦
Sponsored · Parts
Top-rated parts for this repair
Direct-fit · Same-day shipping · 4.7★ average rating
Frequently asked questions
What does P0430 mean?
Same as P0420 but affects Bank 2 (passenger side on V6/V8 engines). The downstream O2 sensor reports the catalytic converter is not reducing emissions adequately.
Is P0430 serious?
Safe to drive short-term — fix within 2 weeks.
How much does it cost to fix P0430?
Repair costs for P0430 range from $120 – $300 depending on the root cause and your vehicle.
Can I drive with P0430?
You can drive short distances but should have it repaired within 1-2 weeks to prevent further damage.