Diesel: the defects of the Diesel particulate filter – Dpf delete

Particle filter, also called DPF – dpf delete is one of the most important elements of the vehicle. It is a device specific to diesel engines whose role is to reduce the emission of pollutants. Like any other part of the vehicle, it can have problems, it can be clogged or dirty. In this article, you are told about the repackaging FAP: what is it exactly and what are the risks.

Reconditioned particle filters: the essentials to know

Vehicles equipped with a diesel engine have different pollution control systems:

  • A catalyst
  • An exhaust
  • Particle filter

The latter plays a very important role: it reduces the emission of particles harmful to humans, namely: the hydrocarbon and carbon of the diesel engine.

  • The presence of device is mandatory for all polluting vehicles, it meets environmental standards and European standards.
  • This device is located just after the catalyst, it has a honeycomb structure.

The operation of the FAP is easy to understand: when the exhaust passes through the FAP, it retains these harmful particles deemed carcinogenic.

Once trapped in the porous walls, these particles form soot and in the end they are burned at a certain temperature. That the life of the DPF can match that of the vehicle to the extent that the driver takes the right actions.

Clogged particulate filters: what are the risks?

If the temperature of the gases does not reach 550 ° C, the soot is not burned properly and accumulates on the filter. This can cause clogging or worse cause the engine to malfunction.

Therefore, the regeneration of the DPF becomes indispensable. This is an automatic system to clean the filter by burning soot layers trapped in the filter.

To succeed in this process, it is necessary to have a very high temperature ranging from 550 to 650 °. To reach it, the engine must turn at about 3000 rpm.

Apart from the automatic regeneration, it can also be a regeneration workshop, forced or kilometric. Unfortunately, if the DPF is too clogged, these processes become impossible, and can lead to breakdowns, namely:

  • The engine loses its power: car less sluggish, engine choking and stalls
  • The vehicle automatically switches to “degraded mode”
  • The engine warning light comes on

If any of these problems occur, it is best to proceed with repackaging the DPF.


As a mechanical engineer turned blogger, Charlie provides readers with a technical, yet accessible look into the world of automotive engineering and design. His insightful posts make complex car technologies understandable.