DPF (Diesel Particulate Filter) is a filter fitted in modern diesel cars to trap black smoke particles (soot) from exhaust gases. It helps reduce pollution and meet strict emission rules. Without DPF, diesel cars cannot pass modern environmental standards.
How DPF Works
When engine runs, soot collects inside the filter. After some time, the car automatically cleans it through a process called regeneration. In this process, exhaust temperature rises and burns the soot into ash. This usually happens during long drives at a steady speed.Why DPF Gets Clogged
Short city drives are the biggest problem. If you mostly drive in traffic or for small distances, the engine never gets hot enough for regeneration. Soot keeps building up and can block the filter. A clogged DPF causes warning lights, poor pickup, high fuel use, and sometimes limp mode.How to Prevent DPF Problems
- Take your car for a 15–20 minute highway drive once a week.
- Avoid constant low-speed driving.
- Use good-quality diesel fuel.
- Do not ignore DPF warning lights.
- Use manufacturer-recommended engine oil.
Important Terms You Must Know
- Regeneration: Self-cleaning process of DPF.
- Passive Regeneration: Happens automatically on highway drives.
- Active Regeneration: The car injects extra fuel to raise the exhaust temperature.
- AdBlue: A liquid used in newer diesel cars with SCR systems to reduce nitrogen oxide emissions. You must refill it periodically.
- SCR (Selective Catalytic Reduction): A system that works with AdBlue to cut harmful gases.