Sensor Hanging off Front Bumper

*Sorry. Posted this in the Convertible section out of habit for my car. Could any mod please move this? Thanks.



Hi Guys,



My brother just sent me a picture of some sort of sensor hanging off his front, passenger side bumper. He has a 2004 330i. What does this look like it could be? I've read of 3 possibilities:



1. Outdoor Temperature (though I read this is on the driver side)

2. Something for the secondary horn

3. Something to do with heating the washer fluid



Any help is much appreciated.