OBD codes / P0430
P0430
ModerateCatalyst System Efficiency Below Threshold (Bank 2)
Get it looked at soon to avoid further wear.
Likely causes
- failing catalytic converter
- faulty O2 sensor
- exhaust leak
Common fixes
- check O2 sensors
- fix misfires first
Seeing P0430 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0430 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.