I think it was because I had a pretty flat front tyre and a lot of wet weather. I say this because it went away once I a) pumped up the tyres all round to the same pressure b) let it dry out for a few days and c) did the computer re-set by disconnecting the battery for an hour or two. C) didn't work on its own so I think the trouble was either tyre or wet sensor related. All I know is, it went away and has not recurred now for over 6 months. Good luck finding a worthwhile dealer though, my local one is similarly ignorant about the vx. The previous owner seemed to have some luck using subaru...?