Diesel particulate filter (DPF): what it is and how it works
What a diesel particulate filter is, how it traps soot, why it needs regenerating and cleaning, and what shortens its life.
Products
Replacement DPF filters
What to check when buying a replacement diesel particulate filter: OEM, aftermarket and remanufactured units, emissions approval, fit and warranty.
Short answer
Before buying a replacement DPF, confirm the old one cannot be cleaned. Then choose between OEM, aftermarket and remanufactured units, checking the exact fit for your vehicle, compliance with the relevant emissions standard, catalyst specification and warranty.
Products are being researched for this category. We only list products with verified manufacturer information. In the meantime, the buying guide below explains what to look for.
Ask about a productBuying guide: DPF filters
Do you need a new filter?
Many filters sold as "blocked" can be restored by cleaning. Replacement is needed when the ceramic is cracked or melted, or cleaning cannot restore flow. See cleaning vs replacement and DPF filter price.
OEM, aftermarket or remanufactured
OEM filters match the original exactly. Aftermarket filters vary in substrate and catalyst quality, so look for emissions approval and a clear warranty. Remanufactured filters should be flow-tested and documented.
What to check before buying
-
Exact fit
Engine code, part number and whether the catalyst is integrated.
-
Emissions compliance
Suitable for the vehicle's emissions standard and testing.
-
Warranty terms
Including conditions around fitting and root-cause repairs.
-
Fitting kit
Gaskets, clamps and sensor parts may be extra.
FAQ
Frequently asked questions
Are aftermarket DPFs any good?
Quality varies. Choose units with clear emissions approval, flow and catalyst specifications and a meaningful warranty.
DPF cleaning vs replacement: which do you need?
When a DPF can be cleaned, when it must be replaced, and how regeneration fits in. With a side-by-side comparison.
DPF filter price and replacement cost
What decides the price of a replacement DPF filter, OEM vs aftermarket vs remanufactured, fitting costs and when cleaning is the cheaper option.
Ask a question
Not sure which product you need?
Tell us the vehicle or equipment and the problem you are trying to solve. We reply by email.