In April 2009 I bought a one-year-old Nissan X-trail. At the end of July, having covered 2000 miles in France in just over a week the particulate light again came on together with the Malfunction light. After some initial reluctance and a prod from Honest John my local dealer did agree to rectify the problem under warranty although I was continually reminded that my driving style was the cause (slow and short journeys). It took four days - so can't have been all that simple. This week the Particulate light again came on and I decided to avoid all misunderstanding to drive it on a 12-mile section of the M40 at the legal maximum speed and whilst doing this the Malfunction light again came on. I have now taken this up with Nissan direct because local dealers just say that I must be driving it slowly and on short journeys. Nissan themselves say that that is the problem and I must pay for any work and parts unless the dealer happens to find that my driving style is not at fault. I am very suspicious over this. I would have no difficulty in getting many signatures to support me over my driving style