How to Duplicate a BMW Key

1. Take your existing key to an automotive locksmith or BMW dealership. The dealership may charge more for its services, depending on what kind of blank keys are used and the actual cost to replace the key.
2. Have the locksmith or dealership make and program a replacement microchipped key.
3. Test the key to make sure it works. Open the doors and start the car. Keys that are not correctly programmed sometimes still work to open car doors, but will not start the car.