🚗💨💨Common Causes Of Diesel Particulate Filters (DPFs)🚗💨💨 What Causes DPFs To Block or Fail? We always get asked this question, so here’s a few things that are common causes. Firstly, a Diesel Particulate Filter (DPF) is a Filter on the exhaust system which collects carbon soot and ash from your engine. It stores it in a chamber to help lower Emissions. It then performs a DPF Regeneration, Of which the chamber reaches a high temperature which burns off excessive carbon and soot, there are m