Hi Ron, Thanks for the update. Moisture perhaps may be at fault as after washing and a shamoius to and outside for a couple of hours to dry off, it is put away into a bone dry garage for months at a time. Just maybe moisture is still present in the LHS mirrow which could be the cause of the problem. Interesting that you have replaced your sensor twice, which indicates that Ford may have a known issue with this item. Once again thanks for your post and advice Ron, Regards, Rob