You may need to reprogram your key/s. The easiest way I can tell you is follow the steps below;
1. Lock the car manually with your key.
2. Open the car manually with your key.
3. Go inside and close the door.
4. Insert the key in the ignition and turn to position 1.
5. Remove the key and hold down the unlock button, then press the lock button 3 times (all this must be within 10 seconds from removing the key). The locks will automatically lock and unlock the car. If that happens then your remote should lock the car again.. If not try this link.....
http://forums.bimmerforums.com/forum...ht=key+program
Please let us know if this works.