P0430
P0430 Catalyst Efficiency Bank 2
P0430 is the bank 2 catalyst-efficiency code. It usually appears on V6 or V8 engines with separate bank 1 and bank 2 converters.
How urgent is P0430?
It may not feel urgent, but emissions and underlying misfire/fuel issues should be handled before damage spreads.
Common symptoms
- Check engine light
- Failed emissions test
- Possible sulfur smell
- Possible power loss if clogged
- Often no symptoms
Likely causes
- Worn bank 2 catalytic converter
- Exhaust leak
- Oxygen sensor issue
- Misfire damage
- Fuel mixture problem
What to check before replacing parts
1
Scan for misfire and fuel trim codes
2
Inspect exhaust leaks
3
Graph O2 sensors
4
Compare converter temperature
5
Confirm bank identification before replacing parts
Use the code with symptoms
A code points at the system, not always the failed part. Add your vehicle, mileage, symptoms, and whether the check engine light is steady or flashing so the AI diagnostic can narrow the next step.