Hi All,

My 2002 M3 has started to have a rather odd Xenon headlight levelling issue. When I start the car, the lights go through the check process by going down, then returning to the up/straight ahead position. When I fire up the Xenon's all seems to be OK.

However, when I start driving it, over the span of say 2-3 minutes, the headlight level gradually drops until the lights are pointing down to about 15-20ft in front of the car?

My guess is that one, or both of the headlight level sensors need to be replaced. Does anyone have any other possible ideas?

Thanks in advance.