A replacement catalytic converter for most vehicles costs between about £80 and £370, and a replacement DPF between about £155 and £590, including VAT. Where the catalytic converter and DPF are one combined unit, as on many modern diesels, expect roughly £315 to £795. Those ranges cover the middle 80% of the more than 3,500 catalytic converters, DPFs and combined units we sell. The rest of this article explains what moves a price up or down, and how to find the exact figure for your vehicle.
The short version: the part your vehicle needs is set by its make, model, engine and emissions standard, so the only price that matters is the one for your exact vehicle. The part finder at the bottom of this page gives it to you in a few seconds.
Typical prices by part type
These figures come from our own catalogue on 26 September 2026. They include VAT, and every price below includes free UK mainland delivery.
| Part | Parts in our range | Typical price (middle 80%) | Median price |
|---|---|---|---|
| Catalytic converter (petrol and diesel) | 3,076 | £77.99 – £369.99 | £156.99 |
| Diesel particulate filter (DPF) | 230 | £154.99 – £585.99 | £294.99 |
| Combined catalytic converter and DPF | 213 | £314.99 – £793.99 | £505.99 |
| Combined catalytic converter and GPF (petrol particulate filter) | 23 | £581.99 – £798.99 | £647.99 |
The median is the middle price: half the parts cost less, half cost more. We give the middle 80% rather than the full range because a handful of parts for rare or high-performance vehicles sit far above everything else and would make the range meaningless for most people.
Why the price varies so much
The engine and the vehicle
A catalytic converter works by passing exhaust gas over a thin coating of precious metals: platinum, palladium and rhodium. A larger engine, or one built to a stricter emissions standard, needs a bigger substrate and more of that coating, which is one of the main reasons prices differ between vehicles. Petrol catalytic converters in our range have a median price of £170.99, diesel ones £137.99.
Separate parts or one combined unit
On many modern diesels the catalytic converter and the DPF are built into one housing. It’s one part to buy and fit, but it does two jobs, which is why combined units sit well above either part on its own. Newer direct-injection petrol engines can have the same arrangement with a petrol particulate filter; see what is a GPF?
Type-approved or standard
This is the difference people most often miss. A type-approved (homologated) catalytic converter has been independently tested to perform like the original for the specific vehicles it’s approved for. It is a legal requirement for most vehicles first registered on or after 1 March 2001. In our range these parts carry an H at the end of the part number, and they cost more:
| Catalytic converters | Parts in our range | Median price |
|---|---|---|
| Type-approved (H suffix) | 1,674 | £230.99 |
| Standard replacement | 1,402 | £102.99 |
A standard replacement is not a cheaper version of the same thing: it is the correct part for vehicles that don’t require approval, typically those registered before March 2001. If your vehicle needs an approved part, fitting a non-approved one is illegal and risks an MOT failure. Our part finder only shows parts catalogued for your vehicle, and type approval and the law explains the rules in full.
Standard or premium DPF
Some DPFs come in two versions. The premium range (a P at the end of the part number) uses a silicon carbide core instead of cordierite ceramic. It withstands higher temperatures and carries a three-year warranty instead of two. Understanding our part numbers has the detail.
What else goes into the total cost
- Fitting. We supply parts; your garage fits them, so ask for a fitting quote alongside the part price. Time varies widely between vehicles. Seized fixings, sensors that have to be moved across and, on some diesels, a DPF adaptation or reset with diagnostic equipment all add to it. Our guides to fitting a catalytic converter and fitting a DPF explain what’s involved.
- The fitting kit. Where a part has a matching fitting kit (new gaskets, clamps, nuts and bolts), it’s included in the price shown. Reusing old, corroded fixings is a common cause of leaks.
- Delivery. Free to UK mainland addresses, with next-day delivery on orders placed before 4pm.
- Warranty. Two years on our parts, three years on premium silicon carbide DPFs. See warranty and how to claim.
Check it’s the part that has actually failed
The cheapest repair is the one you don’t need. An MOT emissions failure isn’t always the catalytic converter: a faulty sensor, a misfire or an air leak can produce the same result, and replacing the converter won’t fix any of them. Likewise, a blocked DPF can sometimes be recovered with a long drive or a forced regeneration before replacement is needed. Our guides to MOT emissions failures, why catalytic converters fail and why DPFs block will help you and your garage narrow it down first.
Found it cheaper elsewhere?
If you find the identical part advertised for less by another UK retailer, tell us before you order. Under our Price Promise we aim to beat the lower delivered price by half the difference again.
Find the exact price for your vehicle
Enter your vehicle’s make, model and engine in the part finder below to see the parts catalogued for it, with today’s prices. Prices change over time, and the product page always shows the current one.
