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Diesel Particulate Filter

Diesel Particulate Filter (DPF)

If you currently drive a recent diesel model, it could be useful to know exactly what a Diesel Particulate Filter (DPF) is, and why they are fitted.

What is a Diesel Particulate Filter?

All modern diesel vehicles are fitted with a Diesel Particulate Filter (DPF) which removes harmful soot from the exhaust gases before they enter the atmosphere.

Do I need a DPF?

Yes, it is required by the European emissions legislation.

The DPF reduces exhaust smoke and black soot caused by the combustion process. As aresult, it both significantly decreases emissions and protects the environment.

How does it work?

Modern diesel cars have to be fitted with a DPF in the exhaust to stop soot passing into the atmosphere. To maintain performance, a DPF has to be emptied regularly. This is usually done passively in a process called 'regeneration', which occurs when the exhaust temperature is high (usually achieved on motorways and fast A-roads).

What should I do if the warning light comes on?

The warning light has illuminated due incomplete regeneration. In order to overcome this, you need to increase the exhaust temperature. To do this, a 10-15 minute journey at asuitable road speed will suffice (this may vary depending on the make and model of the vehicle). This should clean/clear the DPF, however, if the light does not disappear, you mustcontact your vehicle manufacturer.

What happens if I ignore the warning light?

Ignoring the warning light is not advised as this is likely to lead to further problems with the vehicle.

How long does my Diesel Particulate Filter last?

If operated in the correct way, the DPF is designed to last in excess of 100,000 miles.

Do I need a diesel particulate filter to pass the MOT?

As of February 2014, a diesel particulate filter check is part of the MOT.

What do we recommend?

If you buy a vehicle with a DPF, we would recommend that you read the appropriate section in the vehicle handbook. In doing so, you will be fully aware of what action to take shouldyour DPF light come on, ignoring this could be costly.

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