Diesel Particulate Filter
Also called soot trap and FAP. This device catches small soot particles (PM10 and PM2.5) in order to properly dispose it later during a regeneration procedure.
While driving. In most cases driver even didn't know that it took place.
Forcing ECU with diagnostic tool or hidden procedure to force DPF regeneration.
Removing the DPF from the car to clean it manually.
ECU changes fuel/air ratio in order to reach higher EGT.
Uses additive like Eolys to increase exhaust gases temperature and bring down in order to efficient disposal of the gathered soot.