BMW 3 Series Key Fob Battery Replacement, How To e46, e39

BMW three button keys were not meant to be taken apart for battery replacement. If the distance to lock/unlock has diminished, then this is the video for you. If your key just failed, you may require a completely new key from BMW, but try this route first as the replacement battery is less than $5, while a new key from BMW will be closer to $200. If you lose programming within the key, just turn turn the ignition on and off (first position) five times, remove the key and then press unlock three times. Us