it could be serious or it could be just the sensor that is gone, we just had ours done and it cost us £55 there is 2 sensors involved with that light one is just for the light and if that has gone you have no probs but that one is very expensive the other one is the one to worry about and the cost is as above. it could of course be that it is actually showing a fault and then its a garage job
aa, June 2005