I know this is an old post about 4 years old. My front NS indicator stopped working with the rest flashing double speed for the 3rd time since I've had the car with all the rain we are having right now. The last two times the problem cleared itself with a some time and parking the car with the front facing into the sun. This is a damp problem.
This evening I cleared the problem immediately simply by disconnecting the electrical connector from the back of the headlight unit and spraying the plug and socket with WD40, wiping out the excess and reconnecting. Problem is solved without having to pay £600 to £1200 for a new headlight unit. I hope this is a solution that will continue to work in future if the problem happens again.
