Diesel Particulate Filter
From Automotive Wiki from mr-fix
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.
Contents
DPF Regeneration
Automatic regeneration
While driving. In most cases driver even didn't know that it took place.
Forced regeneration
Forcing ECU with diagnostic tool or hidden procedure to force DPF regeneration.
Manual emptying
Removing the DPF from the car to clean it manually.
Versions
Dry
ECU changes fuel/air ratio in order to reach higher EGT.
Wet
Uses additive like Eolys to increase exhaust gases temperature and bring down in order to efficient disposal of the gathered soot.