Oh great - I'm not alone.   I dont have heated seats (dont have a heater full stop if anyone has a bright idea to make it work - would be nice) - dont have headlamp washers, I've checked the fuel filter (replaced it in fact) no water in it, but the light is still on. has been for about a week and a half now. it's not getting any brighter/dimmer.   My car has'nt been washed for about 3 months now - so if it IS a build up of grime on the winter pack sensor - why hasn't it come on before - I do 300 miles a week motorway driving.   Next thing is - where is this sensor..