P0430 Catalyst System Efficiency Below Threshold (Bank 2)

Powertrain Severity: Moderate Generic OBD-II

The catalytic converter on bank 2 is not working efficiently.

Common causes

  • Worn catalytic converter
  • Exhaust leak
  • Faulty downstream O2 sensor

Symptoms

  • Check engine light
  • Possible failed emissions test

What to check

  1. Check for exhaust leaks
  2. Compare O2 signals
  3. Rule out misfire and rich running

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0430, follow the service information for that make and model.