hi. the exact same thing has started to happen to my 2.1td 406. first off it did it afew times a week now its happening everytime you use the indicator. i think the problem is the indicator stalk and the switch inside the steering column. i think the switch must have worn out somehow and there is a permanent contact made. don't think it would cost alot to get this fixed as long as you don't go to the main dealer.
dan
April 2008