P0430 Honda Pilot
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 Honda Pilot 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 Honda Pilot.
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 Honda Pilot.
Common Causes on Honda Pilot
- Deteriorated catalytic converter on Bank 2 (rear catalyst on V6)
- Downstream O2 sensor failure giving false catalyst readings
- Exhaust leak between catalyst and downstream O2 sensor
- Engine misfire or rich running condition damaging the catalyst over time
Symptoms
- Check Engine Light on
- Failed emissions test
- Sulfur/rotten egg smell from exhaust
- Slight reduction in fuel economy
- Possible rattling from inside the catalytic converter
Notes for Honda Pilot
Catalytic converter replacement on Honda V6 models is expensive — always confirm with downstream O2 sensor data and verify no underlying misfire is killing the new cat.