Severity: Moderate
Drivable, but it can cause more damage or poor economy. Get it checked within days.
What P0430 means
Same test as P0420, on bank 2 (the side of a V engine without cylinder 1).
Symptoms
- Usually none
- Failed emissions test
Common causes
Most likely first
- 1Aged catalytic converter on bank 2
- 2Exhaust leak on bank 2
- 3Lazy O2 sensor
- 4Past misfire or oil consumption
How we diagnose it
- Repair misfire and fuel trim faults first
- Smoke or listen for exhaust leaks
- Compare O2 sensor activity bank to bank
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.