Originally Posted by Richard@M-World
Try resetting the service computer and see if the warning goes away. Here are the instructions: http://www.e90post.com/forums/showthread.php?t=51049
If it does not go away after resetting, one of your sensors may be broken, missing, etc. as others have suggested.
This service reset isn't working on my car. It wants me to reset the mileage which there is no way to do.