Everything you need to choose, fit and look after catalytic converters, DPFs and related exhaust parts — written plainly, based on the manufacturer’s own technical guidance and UK law. If you can’t find an answer here, call us on the number above or email info@cathive.co.uk.
Choosing the right part
- What does a catalytic converter do? — how cats work, petrol vs diesel, and why they need replacing.
- What is a DPF? — soot traps and regeneration: passive, active and forced, explained properly.
- Type approval and the law — when an approved part is legally required, and how to tell a part qualifies.
- Euro emissions standards explained — Euro 1 to 6, clean-air zone charges, and finding your vehicle’s standard.
- Understanding our part numbers — what BM11, FK, PP and the H and P suffixes mean, and why serial numbers matter.
Fitting
- Why catalytic converters fail — diagnose the real cause before you fit, or the new cat dies the same way.
- Why DPFs block — the full pre-replacement checklist, from driving patterns to glow plugs and fuel vaporisers.
- Fitting a catalytic converter — step-by-step removal and installation, with the warnings that protect your warranty.
- Fitting a DPF — the mechanical swap and the ECU set-up that makes or breaks the job.
- Vehicle-specific fitting notes — Vauxhall Zafira, Euro 5/6 Fords, BMW diesels and other known quirks.
Aftercare, MOT & warranty
- MOT emissions failures explained — what CO, HC and lambda readings actually point to before you buy anything.
- Looking after your DPF and catalytic converter — the habits that make these parts last the life of the car.
- DPF removal and the law — why removal is illegal, how the MOT catches it, and what to do instead.
- Warranty and how to claim — what’s covered, what isn’t and why, and how to make a claim go smoothly.
Ready to find your part? Start with the part finder — or search any Klarius, Bosal, Walker, EEC or OE part number directly from the search box.