P0430 Ford F-150
Catalyst System Efficiency Below Threshold (Bank 2) · Powertrain Code · Medium
What is P0430?
The catalytic converter on bank 2 is not operating efficiently. Same as P0420 but for the opposite bank.
When the Ford F-150 triggers code P0430 (catalyst system efficiency below threshold (bank 2)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Ford F-150.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford F-150.
Common Causes on Ford F-150
- Worn-out catalytic converter on bank 2 — catalyst efficiency below threshold
- Engine running rich for extended period due to other issues (P0172/P0175) damaging the catalyst
- Exhaust leak before the downstream O2 sensor
- Contaminated catalyst from coolant or oil entering the exhaust
Symptoms
- Check engine light
- Sulfur / rotten egg smell from exhaust
- Reduced engine performance
- Failed emissions test
- May notice decreased fuel economy
Notes for Ford F-150
Do not replace the catalytic converter until you fix the root cause — a stuck EVAP purge valve or rich-running condition will destroy the new converter too.