P0430 Catalyst System Efficiency Below Threshold (Bank 2)
What does P0430 mean?
P0430 — Catalyst System Efficiency Below Threshold (Bank 2) (bank 2). This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects catalyst system efficiency below threshold (bank 2) on bank 2. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0430
- Failing catalytic converter on bank 2
- Faulty bank 2 oxygen sensors
- Exhaust leak before the bank 2 downstream sensor
- Bank 2 engine misfires over-fueling the converter
- Damaged exhaust system components
How to fix P0430
- Compare bank 1 and bank 2 O2 sensor activity on an OBD-II scanner
- Smoke test the exhaust for leaks on the bank 2 side
- Verify no misfires exist that could damage the converter
- Monitor fuel trims for coolant or oil contamination
- Replace the bank 2 converter if efficiency test fails