Since 2009, diesel cars have been required by EU law to be fitted with a diesel particulate filter, in a bid to reduce emissions and drive down air pollution. These devices catch the small pieces of soot released by burned fuel. Once they fill up, the soot is burned to ash – either by passive regeneration (when the exhaust temperature is hot enough to burn it) or active regeneration (a process initiated by the car). Diesel particulate filters have proven to be a very effective way to combat pollution. However, over time they can become worn out and defective. Additionally, vehicles produced before 2009 may need to have them fitted before they can legally go on the road. Get diesel particulate filters for all kinds of exhaust systems at great prices from Euro Car Parts – with over 130,000 different parts stocked, we’re sure to have the products you need.