Diesel Particulate Filter (DPF)

A Diesel Particulate Filter or DPF is basically a trap or filter that is fitted in the exhaust system, it catches bits of soot and dirty particles expelled by the engine.


DPF's have been fitted to all diesel cars from 2009 when euro 5 emissions standards came in in fact many cars registered before 2009 will have had one fitted too in anticipation of the change in standards.


As with any filter a DPF needs cleaning periodically and this is done automatically, by burning up the particulates in a process called regeneration. For them to work efficiently, the car needs to be driven at a constant speed of around 60 mph, for at least fifteen minutes,extra post combustion fuel is injected by the cars ECU to allow the DPF and exhaust to heat up enough to regenerate, effectively burning itself clean. With modern day traffic conditions and people using their cars for urban commuting,certain motorists might find this impossible. With the benefit of Noble Motorsports state of the art Maha rolling road (dyno) regeneration can be made easy, and can be done as part of your yearly maintenance on our Dyno ,driving at constant speeds without having to worry about traffic and other influences.


If your car has become sluggish and unresponsive with restricted performance,or you have a dpf symbol showing dpf the chances are you could have a dpf issue. DPF's are extremely expensive to replace. For example, according to Auto Trader pricing guide a DPF in a Fiat 500 1.3 diesel manufactured between 2009-13 will cost £1,200, while an Audi A4 2 litre diesel built between 2007-10 will cost nearer £2,000. A Mini 1.6 DPF replacement cost typically hits £1,420 while the Volkswagen Polo will be £1,170 so what are your options.


Forced regeneration is your first step in fixing your DPF fault, it is required where soot levels have increased within the DPF to a point where normal regeneration cannot be performed: typically around 70% soot loading. At this point the vehicle will enter a 'restricted performance' mode to prevent further damage. If left the soot loading will keep rising. Here at Noble Motorsport we have all the necessary vehicle diagnostic equipment to carry out a forced regeneration both static and on our state of the art Maha rolling road. However if the vehicles DPF is above around 85% soot loading a regeneration can no longer be performed and the DPF will need removing or replacing.


Removal benefits:

  • Increased Fuel Efficiency (Miles Per Gallon)
  • Increase Performance and Torque
  • No more expensive repair costs or filter maintenance costs

The DPF can not just be removed as your vehicles Engine Control Module (ECM) will continue to look for it and warning lights will show on the dashboard. However Noble Motorsport can reprogram the ECM making it unaware that it has lost its DPF. This now enables us to remove the DPF safely without creating more warning lights. The Diesel Particulate Filter is first removed from the exhaust system the filters steel box is then opened up and the blocked up internals or filter are removed. The box is then re fitted to the exhaust system. Leaving your exhaust looking in its factory condition only with the troublesome DPF internals removed.

DPF removal prices start from £250 + vat subject to vehicle and DPF location