What is the DPF and why does it need cleaning?
A diesel particulate filter (DPF) captures and stores exhaust soot to reduce emissions. As the soot is burnt off and the DPF is regenerated ash accumulates. The DPF and needs to be periodically cleaned to remove the accumulated ash. If the ash is not removed the soot holding capacity of the DPF will gradually reduce and back pressure increase leading eventually to a failed DPF.
Under continuous low load conditions, or when engine issues are present, DPF’s may also become blocked with soot. The FSX process also effectively removes this.