What is a diesel particulate filter?
A diesel particulate filter (DPF) captures and stores exhaust soot in order to reduce emissions from diesel cars. Because of a limited capacity, the trapped soot has to be burned off to empty its contents.
When the DPF is blocked, other systems on the vehicle take over and burn off the soot all in one go so that the filter becomes clean again. This is called regeneration.
If the DPF is becoming clogged with soot or a fault develops in the system, an orange light will illuminate on the dashboard.
What is a DPF regeneration?
A DPF regeneration occurs when the predetermined soot content limit within the filter is reached. The vehicle's ECU injects extra fuel into the engine to raise the temperature of the exhaust to incinerate the stored soot. However, problems can occur if the journey is too short, as the regeneration process may not complete fully.
If this is the case, the warning light will continue to show meaning that the filter is still partially blocked, in which case it should be possible to complete a regeneration cycle and clear the warning light by driving for 20 minutes or so at steady speeds between 40-60mph. You will know whether active regeneration is taking place by the following symptoms:
What do I do if the regeneration warning light stays on?
If your warning light continues to stay on, turns red or additional DPF lights come on, do not leave it too long before getting it checked out.
More damage can be caused this way and what could be an inexpensive fix can become something much more expensive.
It is the failure to complete a regeneration that causes most diesel particulate filter issues.
What do I do now?
At this point, your vehicle's handbook will direct you to consult with your garage, which is where we can save you money. Many main dealer workshops will advise that the filter will either need to be removed to be cleaned or replaced at a considerable cost. We can provide you with an alternative solution. Our DPF treatment flushes out soot, ash and other contamination from your vehicles clogged filter without needing to remove the filter or dismantle the vehicle, restoring the filter's original operation, performance and fuel economy. The treatment can be completed in our workshop within an hour.Book now