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How Does the Diesel Particulate Filter Work?
Model: (Various brands) Various
Video tutorial
This short video tutorial explains how the diesel particulate filter works: if you have a car with a diesel engine, you have likely seen the DPF light illuminated on the instrument cluster or the engine light on. The diesel particulate filter is a true filter, with the unique ability to clean itself; but what does it trap and how does it clean itself? The particulate filter traps PM10, which refers to harmful solid particles created during combustion, while allowing the flow of exhaust gases, thus reducing pollutant emissions. Engineers have developed a remarkable self-regeneration system: the differential pressure sensor monitors data upstream and downstream of the particulate filter; as the filter becomes clogged with solid particles, a certain level of back pressure builds up, and when this value reaches a certain limit, the engine control unit will command the regeneration process to start. The DPF relies on the use of additives that allow the filter to regenerate at lower temperatures compared to other particulate filters. In conclusion, to avoid issues, it is essential to follow the regeneration procedures required by the vehicle while driving; if the problem persists and the light remains illuminated, it is necessary to take the vehicle to a mechanic.
Updated on 24 August 2026 by ScegliAuto
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