The Door on My BMW 325i Won#039;t Open With the Key

Resynching a BMW key
1. Position yourself in the driver's seat. Lock the doors of your BMW 325i by pressing the lock button located in the center console.
2. Put the key in the ignition and turn it two clicks clockwise to position '2.' Keep the key in position 2 for three seconds. Turn the key counter-clockwise two clicks to remove it from the ignition.
3. Hold down the unlock button on the key for five seconds.
4. Continue to hold down the unlock button and tap the lock button on the key with your other hand three times. You should hear the locking system cycle. The doors will unlock and then lock again.
5. Step outside of the car and test your key. If the key is not still functioning properly repeat steps 1 through 4 until the synchronization process is done correctly. If your key is still not working, consult a BMW mechanic or lock and unlock your car manually.