How to Open a BMW E66 Key Fob

1. Press the small button in the front corner of the key fob. This releases the spare key from the device. Pull the spare key out of its slot.
2. Examine the key slot to find the indention. Push the spare key into the indention.
3. Lift up the cover while pushing in with the spare key. This pops off the key fob cover and allows you to replace the battery.