A DPF filter is fitted to modern diesel vehicles, the purpose of the dpf filter is to store soot particals from the exhaust gases whilst driving at low speeds and short driving distances. When the vehicle is driven at higher engine revs for a longer period the stored soot in the dpf is cleaned by dpf regeneration, this is done by the engine control unit on the vehicle.
Unfortunately dpf filters can get blocked for a number of reasons, we can diagnose the problem and regenerate the dpf and get the warning lights cleared from the dashboard.