DPF 101: 8 Common Questions by Vehicle Owners, Answered

The Diesel Particulate Filter (DPF) is an essential component that helps reduce diesel vehicle emissions. However, many drivers have questions about the DPF and its operation. In this article, we will answer some of the most common DPF questions and provide information on caring for your DPF.

1. What Is a DPF?

A DPF is a device fitted to diesel vehicles to reduce emissions. It works by trapping and removing particulate matter (soot) from the exhaust gases before they are released into the atmosphere.

2. How Does a DPF Work?

A DPF works by trapping and storing particulate matter (soot) in a honeycomb-like structure. As soot builds up in the structure, the DPF becomes less efficient and needs to be cleaned. This process is known as regeneration.

3. What Is Regeneration?

Regeneration is the process by which the DPF is cleaned. Passive regeneration occurs when the vehicle is driven at high speeds for an extended period. The high temperatures generated during this driving condition cause the soot to burn off and regenerate the DPF.

Active regeneration occurs when the DPF reaches a certain level of soot buildup. The engine management system injects diesel fuel into the exhaust system, which raises the temperature and burns off the soot.

4. Why Do DPFs Need to Be Cleaned?

Unfortunately, the filter can become clogged with soot and other pollutants, reducing effectiveness. DPFs need to be cleaned to maintain their efficiency in reducing emissions if a DPF becomes clogged with soot, even engine damage. If this happens, the filter must be cleaned to ensure it works optimally. This is where a diesel particulate filter cleaning service comes in.

The service involves removing the filter from the engine and using a specialised cleaning process to remove the soot and pollutants. This can include cleaning solutions, ultrasonic cleaning, and other advanced processes.

Once the filter has been cleaned, it is replaced into its original position in the engine. This process can reduce emissions from the engine and improve its performance. It can also help to reduce the risk of damage to the engine or other components caused by a clogged filter.

5. Can a Blocked DPF Be Cleaned?

Yes, a blocked DPF can be cleaned. There are two methods of cleaning a DPF: passive and active.

Passive cleaning occurs when the vehicle is driven at high speeds for an extended period, which generates high temperatures and burns off the soot. Conversely, active cleaning occurs when the engine management system injects diesel fuel into the exhaust system, raising the temperature and burning off the soot. 

In some cases, it may be necessary to have the DPF professionally cleaned through a dealership or specialist DPF cleaning services. 

6. What Happens If A DPF Is Removed?

Removing a DPF is illegal and can result in fines and penalties. It also increases emissions and can cause damage to the engine.

7. How Can I Prevent My DPF from Becoming Blocked?

To prevent your DPF from becoming blocked, regularly driving your vehicle at high speeds for an extended period is essential. This allows for passive regeneration to occur and keeps the DPF clean.

Using the correct diesel fuel type and ensuring the engine runs correctly is also essential. Regular maintenance and servicing can also help to prevent DPF blockages.

8. What Should I Do If My DPF Warning Light Comes On?

If your DPF warning light comes on, it is essential to take action immediately. This may involve driving the vehicle at high speeds for an extended period to allow passive regeneration.

If the warning light remains on, it may be necessary to have the DPF professionally cleaned or replaced. It is essential to address the issue as soon as possible to avoid further damage to the engine.


DPF care is of utmost importance for any diesel-powered vehicle. With an affordable DPF cleaning mobile service, you can have your DPF serviced regularly, prolonging the life of your vehicle and reducing repair costs. Not only does it save you money, but it also provides peace of mind knowing that your vehicle is running safely and efficiently. 

Rely on DPF Fixer Ltd for top-notch DPF cleaning services. We use the latest technology to diagnose and clean your DPF, ensuring your vehicle runs optimally. Our team of experts can also advise on how to prevent DPF issues and extend the life of your filter. Contact us today to schedule an appointment or to learn more about our services.

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