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How a Diesel Particulate Filter is Made

Model: (Various brands) Various
Part: Diesel particulate filter

Video tutorial

In this video, we take the opportunity of a damaged vehicle to see how a diesel particulate filter is constructed internally: it consists of two main sections: the oxidation catalyst that reduces CO (carbon monoxide) and HC (unburnt hydrocarbons) converting them into CO2 and H2O; the actual particulate filter traps soot particles thanks to a honeycomb structure made of silicon carbide and ceramic; the walls are porous: they allow gas to pass but trap particulate matter, causing soot particles to accumulate in the filter.

During long journeys, the heat of the exhaust gas (over 500°C) burns the particles, converting them into CO2. A dirty DPF contains soot and ash: the latter does not burn, and over time clogs the filter.

Being made of precious materials (platinum, palladium, and silicon carbide), the DPF is a delicate and expensive component; if it clogs, it causes a loss of power, the engine warning light to illuminate, and increased fuel consumption. Some remove or empty it, but this is illegal, and the vehicle will not pass emissions tests.


Posted on 13 March 2026 by ScegliAuto


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