OBD · Emissions control
P0430 Catalyst system efficiency below threshold (bank 2)
What this code means
P0430 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: emissions control. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.
Most common causes
- Worn or blocked catalytic converter#1
- Faulty oxygen sensor#2
- Exhaust leak#3
Cost of related repairs
| Independent garage | Main dealer | |
|---|---|---|
| Catalytic converter | £380 – £1,055 | £470 – £1,500 |
| Oxygen (lambda) sensor | £80 – £220 | £105 – £335 |
| Rear exhaust silencer | £130 – £340 | £165 – £505 |
How to read this code
An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.
Frequently asked questions
What does code P0430 mean?
P0430: Catalyst system efficiency below threshold (bank 2). P0430 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: emissions control. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.
Can I drive with code P0430?
Monitor. You can drive normally but get it checked in the coming weeks. It may fail an MOT or roadworthiness test.
How much does it cost to fix P0430?
Catalytic converter: £380 – £1,055, Oxygen (lambda) sensor: £80 – £220, Rear exhaust silencer: £130 – £340.
How to read this code
An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.