resurrecting an old thread. Same thing is happening to my x5 as well. My head lights will sometimes turn on in the dark when set to auto but sometimes they won't come on at all. My rain sensor wipers are not working at all so I'd assume this is the problem. I have 2 small bubbles when I look at the sensor from the outside.

Reading this thread, I would assume I don't need a new sensor module but just need to take out the IR receptor and re-apply it onto my windshield without any bubbles?

@weasel- How do I reset the adaptive memory? maybe I should give this a try first before trying to reposition my IR receptors onto my windshield.