I just found the plastic arm on it is broken. The senor is #1 in the diagram at the link below and the platic arm is broken at where the #5 nut goes in. So, that tiny rod(#3) is currently not attached to the arm on sensor.

http://www.realoem.com/bmw/showparts...=31&fg=05&hl=3

I identify the sensor by the shape of bracket it's attached to. But not sure if it's really the sensor I'll need because there are several other sensors on the same diagram are called 'LEVEL SENSOR' as well. Is it the one that controls headlight aiming level? Is the sensor labeled #1 the right one I'll need to get?

It looks like I can have a jerry-rigged fix. What do you think? The sensor is pretty expensive. ($80 something on the parts website.)