Hi Ross. I have a 52 plate Citroen Xsara Picasso deisel 1.6. The auto lighting is displaying a fault and I have noticed that the rear fog lights are not coming on, although the front ones are. I have had the rear light clusters off to check the bulbs and all looks ok. It may be a fuse, but the only reference I can find is to fuse 19. I cannot find fuse 19! I also noticed that the off side tail light may be a little loose as it sometimes does not come on unless you jog it. The main thing is getting the rear fog lights working. Should have mentioned, it is the 'exclusive' model.