A Diesel Particulate Filter (DPF) is a device that is fitted to the exhaust system of diesel cars in order to reduce the amount of harmful soot and particles produced during the combustion process. It is designed to filter out harmful soot and other particles emitted from the engine. The DPF captures and stores exhaust ash particles and other particle matter from diesel exhaust gas. Over time, the DPF can become clogged with these particles, which can cause engine performance issues and even damage the filter itself. The most common method of clearing a DPF is through a process called regeneration, which is a process in which the engine is made to run at a high temperature in order to burn off the particles trapped in the filter. There are two types of regeneration: passive and active. Passive regeneration occurs when the car is running at speed on long motorway journeys which allows the exhaust temperature to increase to a higher level and cleanly burn off the excess soot in the filter. Active regeneration is usually done automatically by the vehicle, but can also be done manually.

Here are some additional information about DPFs:

• DPFs are part of a diesel cars exhaust system thats designed to filter out harmful soot.
• DPFs can last up to around 100,000 miles if maintained properly.
• If a car needs a new DPF, costs can vary depending on the type of car. Usually, its around £1,000 for a replacement but prices can be lower or higher depending on the exact specification of car in question.
• It is illegal to drive a car that was designed to have a DPF without one fitted. This is because should you remove it, your car no longer meets its emissions standards. Owners face fines of up to £1000 for cars and £2500 for vans if caught. Removing a DPF can also invalidate your car insurance policy.