Dpf, diesel particulate filters became a legal requirement in order for diesel cars to meet Euro 5 specification, which was introduced throughout Europe in 2009, and so if you have a diesel car, with a factory build date after 2008, then it is almost certain that your car will have a DPF system fitted.
However several manufacturers were fitting DPF systems long before the Euro 5 legislation became mandatory, in order to reduce the emissions from large engined diesel vehicles or those with 4 wheel drive, so it is possible to find a car containing a DPF system as far back as 2002.
Here are some Cars which are known to have a Diesel Particulate System fitted before 2008.
Audi 3.0TDI A6 (Some Automatics had them before 2008)
Bmw 325D (All years)
Bmw 330D / 520D / X3 3.0D / X5 (From 2005)
Bmw 320D / 520D (From 2007, DPF a factory option on 2005 – 2007 models).
Citroen / Peugeot 2.0 HDI (Some 2003 – 2005 Models)Citroen / Peugeot 1.6 HDI (all models)
Fiat 1.3 Multijet (All Models)
Fiat 1.9 Multijet (120 & 150 bhp Models)
Mercedes 220 CDI Versions (2004 / 2005 models only)
Mercedes 320 CDI Versions (From 2005)
Vauxhall / Opel 1.3 cdti (All Versions)
Vauxhall / Opel 1.9 cdti (From 2005)
Volvo (All D5 180BHP Versions)
VW 2.0 TDI 170 BHP
VW 1.6 TDI
This list is not complete, so you should not just assume that if your Pre 2008 car doesn’t appear on it, that there is no DPF Fitted, it is also important to check further.
Generally cars which don’t have a DPF fitted will have an exhaust pipe which points downwards, and there will be very little soot around the actual exhaust pipe exit, so if the exhaust pipe is relatively clean when you run your finger around the inside of the pipe, then its reasonable to assume that there is a DPF filter fitted.
Another way to check for the existence of a DPF, is to see what type of oil it uses. This is stated in the handbook or on a label in the engine compartment. If the car requires a low ash (Low SAPS) oil, then it indicates the presence of a DPF.
Finally, if you are still unsure, take the VIN number from the vehicle and contact the dealer / manufacturer as they will be able to see what options your car was supplied with at the factory and whether a DPF was amongst them.