View RSS Feed


Understanding Your Car: The Diesel Particulate Filter
Rate this Entry
Understanding Your Car: The Diesel Particulate Filter

Award-winning Audi, VW, Seat, Skoda and Bentley specialist RAC London is here to help you understand your car better. This month: what is the Diesel Particulate Filter?

First things first, what is it? The diesel particulate filter (DPF) is part of the exhaust system in a Audi, VW, Seat and Skoda car. Since 2008, to comply with the latest European regulations, most diesel engines have had DPFs fitted.

In simple terms, the DPF captures and stores the harmful soot that’s a by-product of diesel engine exhaust emissions produced when the engine is running.

For cars that regularly travel on motorways at constant high speed, ‘passive regeneration’ takes place automatically. This process burns away the soot in the DPF and is initiated by the engine control unit without the driver needing to do anything about it.

However, in cars that drive mainly around town, this process doesn’t get the chance to happen routinely. So when the DPF gets to about 40% blocked, the engine’s control unit will try ‘active regeneration’. This is when it adjusts fuelling to allow the exhaust system to burn hotter to try and dispose of the soot by burning it away.

By now the DPF warning light should be appearing on the dashboard. At this point the best thing to do is go for a motorway drive, following the instructions in the owner’s handbook. And if the process is successful, the warning light will go out.

But if this warning is ignored or the diesel particulate filter is not allowed to complete its burn cycle, it may become up to 75% blocked. More warning lights appear and there will be a lack of power from the engine.

Unfortunately by now there’s nothing a driver can do except come and see us so we cancarry out a ‘forced regeneration’ of the DPF using our Audi, VW, Seat, Skoda and Bentley specific diagnosis machine. Russell Automotive Centre

However, if the driver has ignored the final warning signs, it’s possible the DPF will be blocked to the point where even a forced regeneration won’t work. Then they could be looking at buying a new DPF at a cost of over £1000.

The diesel particulate filter is an effective and eco-friendly engine feature. Look after it and it’ll keep you green for years to come.

Russell Automotive Centre, London's Leading Audi, VW, Seat, Skoda and Bentley Specialist.

0208 2000 995
0 0 0

Submit "Understanding Your Car: The Diesel Particulate Filter" to Digg Submit "Understanding Your Car: The Diesel Particulate Filter" to Submit "Understanding Your Car: The Diesel Particulate Filter" to StumbleUpon Submit "Understanding Your Car: The Diesel Particulate Filter" to Google

Tags: ek5eia0a Add / Edit Tags


  1. pucka123's Avatar
    my name is viktor
    and i have audi a6 2007 2.0tdi automatic gear box
    in my car consumption fuel gauge don't work
    maybe you know problem
    0 0 0
  2. RACLondon's Avatar
    Hi Viktor, I will be happy to have a look at this for you please give me a call so we can discuss. Steve Russell 0208 2000 995
    0 0 0



Disclaimer: VW Audi Forum is an "independant enthusiast website", administered in line with guidelines supplied by VAG in the UK, and is in no way related to any of the Worldwide Volkswagen,Audi,Seat,Skoda,Bentley,Bugatti,Porsche or Lamborghini group of Companies. For official up to date information on any of there vehicles, please visit the official websites. Any comments made throughout this website, are the views of the respective poster, and in no way represent the views of the VW Audi Forum Administration, or the worldwide Volkswagen & Audi Group of companies.

VW Audi Forum do not vet and are not responsible for any information which is posted in this forum. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information.

Copyright: Certain "words", "phrases" and "Images" used on this website by the Administration are "Copyright" of Volkswagen GB, Volkswagen AG (Germany), Audi GB, Audi AG (Germany), Volkswagen Motorsport GB, Volkswagen Motorsport AG (Germany), Audi Motorsport AG (Germany), Volkswagen Racing GB, Bentley, Bugatti, Porsche and Lamborghini. No image can be replicated by anyone WITHOUT the relevant Companies written permission.

All trademarks and copyrights remain property of their respective owners.

No part of the VW Audi Forum website or forum may be reproduced without written permission from the site administration


This website and forum are best viewed at a minimum resolution of 1024 by 768.


- VW AUDI Forum - The #1 Volkswagen (VW) Group Forum - Volkswagen (VW) - Audi - Seat - Skoda - Bentley - Bugatti - Lamborghini - Porsche - Scania - MAN - Ducatti - VW Audi Forum -

- - -