Cost Guide
Catalytic converter replacement
Check engine light with fault codes P0420 or P0430. Price varies by make, model and region — select your car below for an accurate estimate.
See pricing for your car
Parts, labour and total cost for your exact make and model.
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Common symptoms
- Check engine light with fault codes P0420 or P0430
- Sulphur or rotten egg smell from the exhaust
- Reduced engine power or noticeably sluggish acceleration
- Rattling noise from underneath the car (broken catalyst substrate)
- Failed emissions test or MOT/inspection failure
What affects the price
- OEM vs direct-fit aftermarket vs universal (OEM recommended for emissions compliance)
- Whether the vehicle has multiple catalytic converters (common on V6/V8)
- Whether upstream oxygen sensors need replacing at the same time