Understanding the role of the PPF. For over a decade diesel cars have been fitted with something called a DPF, which stands for Diesel Particulate Filter.Without digressing, it's basically a filter that reduces harmful exhaust emissions that are produced by diesel engines. 11 months ago I bought a new Volkswagen Golf Bluemotion diesel, which I am delighted with. However I am so worried about your comments about the risk of expensive failure of low emission diesels that I am considering exchanging it for a petrol-engined car. You mention problems with diesel particulate filters, dual mass flywheels, exhaust gas recirculation valves and turbochargers. If repairs Not many drivers know what a Diesel Particulate filter (DPF) is – until it costs them serious money. And replacing one can cost £1000 or more. Green Flag attends a lot of cars that have broken down with DPF problems and they are caused by one primary factor: the DPF is clogged with soot because the driver has ignored the warning lamp. Answered by Dan Powell. Sadly not. The DPF is the reason why the latest Euro6 engines are so much cleaner. The filter needs to perform an active or passive regeneration cycle, if it can't do this then it'll fail to burn off the harmful soot it collects and will clog up. Likewise with the EGR, if the engine doesn't reach its optimum operating Recheck the voltage of the signal. A number between the hoses' pressure readings should appear on the voltage display. For instance, if the front hose reads 1 PSI and the back hose reads 1⁄2 PSI, the signal wire voltage should fall somewhere in the middle, around.8 volts. The DPF differential pressure sensor needs to be changed if there is a Our advice on buying a used diesel car is because a replacement DPF can cost between £1000 and £3000 it is important that you check the current mileage of the vehicle, and the recommended DPF replacement intervals in the vehicle manual. Most DPF’s need to be changed every 100k to 120k intervals, but some can be as low as 70k to 90k. Mid 2010 see's the addition of a Dpf filter to meet Euro 5 emission regulations. MK3 is as late MK2 all models include Dpf however the UK does not include 6 speed multimode transmission. The above is a brief run down of the UK history, this may differ in other countries." Quote. From the Euro 5b stage (2011.09 for new types, 2013 for all models), all diesel vehicles require a DPF to meet the PN emission limit. In the United States and Canada, particulate filters have been introduced on diesel cars and light trucks meeting US EPA Tier 2 emission standards. Heavy-Duty Engines. Yes! Diesel cars have a catalytic converter but not the same as that petrol or gasoline motor vehicles. Today, most Diesel engines have emission controls that consist of four stages; Exhaust Gas Recirculation (EGR), Diesel Particulate Filtration (DPF), Diesel Oxidization Catalyst (DOC), and Selective Catalytic Reduction (SCR). As suggested by mjq1602 Discussion starter. 121 posts · Joined 2016. #1 · Apr 19, 2016. So just ordered a Vauxhall astra diesel estate for the dog (no way the bitch is getting in the mini) and the salesman started banging on about diesel particular filters. Never heard of them before but got me thinking as the mini will have one. i6HD.