A diesel particulate filter is a filter in the exhaust system of modern diesel vehicles. It is designed to trap larger carbon particles and soot which is emitting from the engine, and prevent it being released into the atmosphere.
The DPF must burn off this 'trapped' carbon at some point, in a process known as a 'regeneration'. This is done when conditions are suitable, usually on a longer motorway journey when the exhaust temperatures can reach a high enough level to burn off the carbon and regenerate the DPF. Burning the carbon at extreme temperatures releases much smaller particles from the exhaust, and doing this on a motorway at one point prevents the harmful gases from being released in cities and other built up areas.Read More