Code
P0430
Emissions
Catalyst efficiency below threshold — Bank 2
The bank 2 catalyst is below efficiency threshold.
Advertisement
Most likely causes
- Worn catalyst
- O2 sensor issue
- Exhaust leak
Symptoms you may notice
- Check engine light
- Failed emission test
Checks to run
- Compare O2 waveforms
- Check for leaks
- Fix misfires first
Tools you may need
OBD-II scanner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.
Related codes in Emissions
P0420