Mazda 3 Catalytic Converter
Replacement catalytic converter — fitment, symptoms & live UK prices.
Fits Mazda 3 — check your reg/VIN to confirm
Catalytic Converter
Aftermarket £80–£250; OEM much more.
View Catalytic Converter on eBay🛡️ eBay Money Back Guarantee🇬🇧 UK sellers↩️ Easy returns
Will it fit my Mazda 3?
Must be the correct emissions-spec cat for your engine and year, or it'll fail MOT. Type-approved units only.
Tip: filter by your reg on eBay's compatibility check, or match the part number stamped on your old unit.
Signs your Mazda 3 catalytic converter needs replacing
- P0420 / catalyst efficiency code
- Rattling inside (broken substrate)
- Failed emissions/MOT
- Sluggish, rotten-egg smell
Fitting it yourself
Bolt-on or welded depending on setup. Lambda sensors often transfer over.
See Catalytic Converter prices on eBayMore Mazda 3 parts
Live pricesAftermarket £80–£250; OEM much more.
View on eBay