Catalyst System Efficiency Below Threshold (Bank 2)
The catalytic converter on bank 2 is not operating as efficiently as expected.
Common causes
- Worn catalytic converter
- Faulty downstream oxygen sensor
- Exhaust leak
- Engine running rich or lean
Possible symptoms
- Check Engine Light on
- Reduced fuel economy
- Sulfur smell
- Failed emissions test
Can I keep driving?
You can drive short distances, but don't put it off: this is a medium-severity fault that can raise fuel use and emissions and, if ignored, damage other parts. Have it looked at soon.
Code breakdown
Frequently asked questions
What does code P0430 mean?
P0430 stands for "Catalyst System Efficiency Below Threshold (Bank 2)". The catalytic converter on bank 2 is not operating as efficiently as expected.
Can I keep driving with code P0430?
You can drive short distances, but don't put it off: this is a medium-severity fault that can raise fuel use and emissions and, if ignored, damage other parts. Have it looked at soon.
How do I diagnose and fix code P0430?
Diagnosis starts with the most common causes, checked in this order: Worn catalytic converter; Faulty downstream oxygen sensor; Exhaust leak; Engine running rich or lean. Reading live data with an OBD-II tool helps confirm the fault before replacing any parts.
Related codes
- P0400 — EGR A Flow
- P0401 — Exhaust Gas Recirculation Flow Insufficient Detected
- P0402 — Exhaust Gas Recirculation Flow Excessive Detected
- P0403 — Exhaust Gas Recirculation Control Circuit
- P0404 — Exhaust Gas Recirculation Control Circuit Range/Performance
- P0405 — Exhaust Gas Recirculation Sensor 'A' Circuit Low