A Diesel particulate filter (DPF) cleans particulate matter or soot from exhaust gas by trapping the particles.
Soot, or black carbon particles, are a result of the incomplete combustion of diesel fuel. Soot and other particles from diesel engines worsen the particulate matter pollution in the air and can be harmful to your health.
DPF systems are an industry response to the ongoing tightening of exhaust emission standards for diesel vehicles.
As with any filter, a DPF will need to be emptied regularly. The system does this by burning the soot off at a high temperature - a process known as regeneration. Where regeneration fails, malfunction warning lights must not be ignored.
Find out more about diesel particulate filters and regeneration (PDF 172 KB)