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Message: <blockquote data-quote="haywire" data-source="post: 539254" data-attributes="member: 16474">That part is attached to the front and rear arms, equipped on cars with the auto-levelling headlight. It will detect how low or high the car is sitting, or how tilted the car is (for example if you load the boot with bricks and the car tilted backwards due to the weight) and adjust the height of the beam automatically. No knob in the car interior to adjust headlight height.The bit on my front is missing, the rears is still in place. Hence the front sensor arm (plastic) is pointing downwards without the metal bit, indicating the car is sitting high and tilted backwards so my headlight was always dipping low whatever I do with the manual adjustment on the headlight.This is another picture from the net, indicating the broken arm (metal part still attached to the arm).Item A is the plastic arm, attached to the sensor, Item B is the broken metal arm, connected to the lower arm<img src="http://www.bimmerfest.com/forums/attachment.php?attachmentid=119912&d=1188851448" alt="" class="fr-fic fr-dii fr-draggable " style="" />Location of the sensor on the front right suspension, item in red circle with the metal arm missing<img src="http://farm7.static.flickr.com/6181/6076526957_a52424b380_z.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>