Fuel filter was changed 12 months ago, the car needs a service though, to be fair. I drive 95% motorway miles and the car does 400-450 miles per week and I try to service it every 8,000 miles but I'm 4,000 late for this one due to one reason or another. It's had fuel injector problems in the past as when I got it it was pretty 'carboned up' and number 1 injector needed to be taken out cleaned off then re-seated. DPF was changed 16,000 miles ago and the guy did say I may get sensor problems as one new part in an older system can throw up errors. The car is an absolute dream in most ways though, I throw the cruise control on at 70 and it just glides to work, I love the stupid old thing, she's just riddled with little issues, unfortunately.