OBD codes / P0430

P0430

Moderate

Catalyst System Efficiency Below Threshold (Bank 2)

Get it looked at soon to avoid further wear.

Likely causes

  • failing catalytic converter
  • faulty O2 sensor
  • exhaust leak

Common fixes

  • check O2 sensors
  • fix misfires first

Seeing P0430 on your car? Get a diagnosis specific to your exact year, make and model.

Diagnose P0430 for my vehicle

Generic OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.