Hi, how do I know if my Freelander TD4 sport has a dpf? It is a MK1 2006. I have been using it as a second car for a couple of years and it only does short journeys now mostly with a trailer attached to pick up building materials. I think it needs a long run and an additive to clear out the filter if it has one as I get the emissions warning light come on when I first start up the engine. It goes off after a few miles but seems to stay on a bit longer each time I use the car.