All new diesel vehicles are provided with so-called wall-flow filters. The diesel particulate filter (DPF) filters the soot particles (Diesel soot) from the exhaust gases. These solid particles become lodged in the honeycomb structure of the particle filter and clog the filter gradually more and more. When a certain pressure in the filter is reached, the vehicle’s electronic system starts the internal regeneration, where the soot particles in the filter are burned to ashes. But by this combustion are only the upper layers of soot affected, so that the filter is gradually clogged with soot and ash. Depending on the filter size accumulate here between approx. 60-200 gram ashes.

Due to the increasing ash content in the filter, the free volume of the filter decreases constantly and the engine electronics starts the regeneration more frequently. Thereby the exhaust gas backpressure as well as the fuel consumption increases, and the engine power get reduced.


Depending on driving behavior either wet soot (short-haul) or dry soot (medium-/long haul) arises. Wet soot clogging the filter much faster than dry soot it does. Thus can particulate filters which are only used on short hauls clogged already at about 70.000km, medium-haul vehicles at approximately 100.000km and long haul vehicles from about 150.000km.


The following example shows why short hauls regularly causes problems to the diesel particulate filter:

Mr. Example drives every day 18 km to work and his way leads mainly through the city, i.e. mainly stop-and-go traffic. Due to this short hauls the water- and oil temperature nearly achieved the needed operation temperatures. Once the car has achieved a certain engine temperature, the regeneration will start although, but due to the short distance it will be repeatedly interrupted. So the filter turns to clogging gradually with sticky wet soot.

If now the filter gets not immediately cleaned or exchanged, damages (EGR valve, turbocharger, etc.) cannot be excluded – because the vehicle must go somewhere with the exhaust gas back pressure. In the most favorable case the vehicle goes into the fail-safe mode and can be operated only with reduced performance. The purchase of a new original filter is connected with substantial costs. Usually new diesel particulate filter costs between 1.000 and 4.000 Euro depending on the vehicle model. Alternatively we can clean your particulate filter for an attractive price!


Initial attempts to emission control existed already in the First World War. This was, however, for reasons of camouflage to avoid the visible smoke plumes of ships. In the automotive sector finally In the automotive sector could Peugeot finally, in the year 2000, made the breakthrough of filter technology. As the first manufacturer which equipped a model with a standard particulate filter. Meanwhile, a car manufacturer can hardly allow offering its vehicles without a diesel particulate filter. Beyond the passenger car segment, filters are useful and also required by law in trucks, in construction machines or in enclosed areas running machines.


For vehicles which are not factory equipped with a filter, a retrofitting is recommended; whereby partial flow filters are easier to retrofit. The tax incentives for a particulate filter retrofit stopped end of 2010, the tax surcharge for non-retrofitted diesel cars in March 2011.


So is the use of particulate filters beneficial in many ways: the environment and human health are protected by reduce or avoid of pollution by soot particles. In addition, a diesel particulate filter has a positively affect to the value of your vehicle.