What is DPF?

What are Diesel Particulate Filters?

Diesel Particulate Filters — or DPFs — are fitted on all modern diesel vehicles. They are filters which remove soot from your vehicle’s exhaust gases before they’re released into the atmosphere. DPFs dramatically reduce the emissions of diesel vehicles, and as such are a requirement to meet modern European emission standards.

DPFs work alongside your vehicle’s Selective Catalytic Reduction (SCR) system. Which also helps to reduce harmful emissions by using AdBlue to turn emissions into steam.

What is a ‘regeneration’?

DPFs are simply filters which catch soot in your exhaust. Over time, the soot will collect and need to be emptied. The process of cleaning a DPF is called a ‘regeneration’.

Do I need to do my own regeneration?

Nope, thankfully your vehicle should take care of it’s own DFP regeneration. However — if there is an error and the vehicle is unable to complete the regeneration, you’ll be alerted by a warning light/message on your instrument panel. You’ll then need to take action.

How do I know if my DPF is ‘regenerating’?

There are a few key clues..

• Increase in vehicle fuel consumption
• A marked increased in idling speed
• Cooling fans running
• Sour-smelling exhaust fumes
• Deactivation of start-stop

What can prevent a DPF regeneration?

• Low fuel level (less than a quarter tank)
• A warning light on or a diagnostic trouble code
• Short journeys where the exhaust isn’t able to reach it’s typical driving temperature
• Low levels of additives (if applicable to your vehicle)
• Exceeding Oil Counter intervals
• Exceeding service intervals
• Using incorrect engine oil for your vehicle
• Exhaust Gas Recirculation (EGR) system issues

My DPF warning light is on — what do I do?

Don’t panic. The system is warning you that the vehicle needs your assistance to complete its DPF regeneration.

To do this, you’ll need to increase the exhaust temperature. You can do this by driving for approximately 10-15 minutes at 2500 RPMs.

If the light still hasn’t turned off, don’t ignore it! If the vehicle is unable to dispose of its soot it could cause very costly repairs and issues. At this point, you should immediately contact your manufacturer or local dealer for next steps.

How long does a DPF last?

DPFs can last for over 100,000 miles. You can extend their life with proper care, driving and maintenance.

Last Updated March 2026