The Diesel Particle Filter was invented in the 1970s (3 prototypes were created) in response to the EU standards that set limits to the amount of pollution that can be emitted by motor vehicles depending on when the vehicle first entered into service.

These standards are known as the EURO standards.

Euro 1: 01 January 1993Filtre à particules FAP
Euro 2: 01 July 1996
Euro 3: 01 January 2001
Euro 4: 01 January 2006
Euro 5: 01 January 2011
Euro 6: 01 September 2015


The PSA Group commercialized the DPF for the first time in the 2000s with its 607 2.2L HDI.

How does the DPF work? Does it have to undergo maintenance? What is a regeneration? Can it be removed? Take a look at our answers to frequently asked questions.

The main function of the particle filter, more commonly referred to as the DPF, is to reduce the amount of fine particle emissions (soot, etc.) comprised of hydrocarbon, which have been found to cause cancer in human beings.

The DPF is part of the exhaust system, and is usually located at the engine’s outlet.

Functional principle of the DPF

The DPF functions in two phases: During the phase one, it collects particles and during phase two, it eliminates them.

  1. Phase one

The filter captures the particles that are flowing in the exhaust gas. A soot layer forms on the filter walls, in the long term  this layer of soot affects the engine performance ,hence phase two.

  1. Phase two

The filter elevates the temperature of the exhaust gases enough to burn off the layers of soot. In order to raise the temperature of the exhaust gases, extra fuel is injected into the DPF, which leads to the combustion of soot trapped in the DPF.

Certain manufacturers inject an additive in order to facilitate the process; PSA’s Cérine is a good example of this: The soot combustion temperature is lowered facilitating evacuation.

This additive can be refilled during maintenance.

Fonctionnement du filtre à particulesSource:

Problems that arise

Problèmes courants d'un filtre à particulesUnfortunately, often times the conditions needed to regenerate a DPF are not met: Many processors of vehicles equipped with a DPF only work in the short term, and the DPF does not reach the temperature necessary in order to regenerate over the course of these short daily trips. It can get so clogged that sometimes regeneration is not possible, which leads to the following:

  • Loss of power
  • Engine light on
  • Less than optimum mode of functioning
  • Drowning engine
  • Stalling engine
  • Build up on DPF
  • Clogged DPF


Although, it is possible to remove the DPF and replace it with a simple tube (eliminator pipe, downpipe, etc…), we strongly recommend against removing your DPF. Not only is it strictly illegal but a new emissions inspection is about to make its debut, where any vehicle missing its DPF will systematically fail inspection.

For updates on new technical control that will take effect in January 2019, visit our page “All you need to know about the evolution of technical control”.

Do you have problems with a dirty, clogged DPF covered in soot and carbon emissions? Schedule an appointment at one of our locations to get your particle filter (DPF) cleaned without disassembly and using an eco-friendly product!

The best solution

If your engine light indicates a problem with your DPF, or if performance is low, or if your mode of functioning is less than optimum, your DPF (particle filter) may be clogged, but we can definitively salvage it and clean it for you:

If you’re considering a cheap alternative to replacing your DPF, that’s where the Hy-Calamine device comes in! Thanks to its innovative process of using the power of post-combustion hydrogen in the form of a solvent, it reduces build up (soot) in the DPF and prompts optimum regeneration, so that your vehicle ends up regaining its original performance! Say goodbye to issues involving black smoke, a drowning engine, stalling, and loss of power due to a clogged or blocked DPF.

If you add descaling to your routine maintenance, your engine will be clean and you will be able to avoid headaches caused by ineffective regeneration, a clogged DPF or blockage.