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What is a Diesel Particulate Filter (DPF)?

DPF Filter

A DPF is a part that is fitted to a diesel vehicle to filter out the soot from exhaust gases. They were introduced as a requirement to meet European emission regulations – designed to reduce 80% of soot emissions from the environment.  As with any filter, the DPF will require emptying regularly to ensure it is working effectively. This is done through a process of re-generation, which involves the burning of the soot to gas at a high temperature, leaving behind only a small residue.

What to do if the Warning Light Appears

dpf filter warning light

When driving on motorways exhaust temperatures are higher than town driving, so the regeneration process happens automatically. Most vehicles are also designed to initiate regeneration once the filter reaches a certain blockage level. If you do mostly town driving where you are stopping and starting a lot and your DPF warning light appears, try driving somewhere above speeds of 40mph to help clear the filter. If the warning light remains on, don’t ignore it- make an appointment at your nearest Evans Halshaw Service Centre to get it checked out as soon as possible. If you continue driving, soot will build up and your car won’t run properly, and you could require a new DPF which can be an expensive to replace.

If you are considering changing your car for a diesel and only do mostly urban driving in towns and cities it is worth considering purchasing a diesel car that doesn’t and never did have a DPF filter fitted when it was manufactured – check the owner’s handbook for details.

DPF lifecycles vary by manufacturer, however they should last for approx. 75,000 miles, so it’s an important point to check within the service record if you are buying a used diesel vehicle with similar miles on the clock that has a DPF fitted.

Despite UK companies widely advertising the removal of DPF to avoid costly repairs, it has never been legal to do so! In fact potential penalties for non- compliance could cost up to £1,000 on a car and £2,500 for LCV.

Diesel motorists should also be aware that from February 2014, a diesel car will automatically fail it’s MOT test if there is no Diesel Particulate Filter (DPF) present, where one was fitted originally when it was built by the manufacturer.

Replacing a damaged DPF is expensive, however there are ways to maintain the filter in your car. We have teamed up with Tuneap to offer three diffent maintenance products to help you save money. To find out more information, contact your local dealership and ask about Tuneap.

If you are concerned at all about your vehicle’s emissions, effectiveness of your DPF or need to book an MOT test, contact your Evans Halshaw on 0844 556 1048 to arrange an appointment at your nearest Service Centre.