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Replace Mini Key Fob Batteries It's relatively inexpensive and easy to replace the battery inside your key fob. Be aware that you may need to reset it and activated. Doing so will ensure that your driver profile for your car is linked to the new key fob and all of its settings such as mirror position and seat positioning. Battery Modern key fobs offer superior features and convenience over a traditional car remote or flip key. The technology does come with some costs as the battery on your key fob will eventually get worn out. If you let it sit until it completely dies it could leave you without access to your car. Replace your car key fob's battery immediately the power goes out. You can utilize a key fob's LED light to test the battery's voltage. If the buttons on the key fob fail to turn on after pressing them then the battery is dead or close to dying. The Keylab used in key fobs are typically small coin-shaped batteries like CR2025 or the CR2032. They are available at auto parts stores, home improvement stores, and general stores. Make sure you buy the right kind of battery, since different fobs require specific cell thicknesses. You can also use a voltmeter to check the voltage of your fob's battery. A good battery should have an voltmeter reading of 3 Volts. If the battery in your fob reads less than 2.8 Volts it should be replaced. Change the battery of your fob is fairly simple and can be done at home using the appropriate tools. There are instructions in the owner's guide and many Youtube videos on the subject. Be careful not to damage any of the plastic tabs which hold the components together. Chip It's probably time to replace the battery in case your key fob doesn't turn on when you push the lock/unlock buttons. You can purchase a new battery at an online retailer or hardware store. The majority of fob batteries cost less than $10. Follow the directions in the owner's manual or on YouTube to replace the battery yourself. Modern electronic keys are more convenient and functional than traditional metal keys. They can also be used to deter car theft. It's important to deactivate your key fob in the event that you lose it or break it. This will prevent it from falling into the wrong hands. Key fobs have an integrated security chip that transmits the signal to your car's ignition system. It disables the immobiliser integrated into your engine control unit and permits you to start your car without the need for a key. Key fobs that have this feature can be costly between $200 and $300. Certain models come with a switchblade that houses the metal component of your car key inside plastic. These keys can be duplicated by locksmiths for less than the cost of a metal key, but dealers must program the replacement to allow the car to start. Some dealers will do this for free or at a cost of a small amount and others might charge a fee. There are also online sites that sell pre-programmed key fobs for very low prices. However they usually require proof of ownership from buyers before sending their product. Reprogramming If your key fob ceases to functioning, the first thing that comes to mind is that it has been damaged and requires to be replaced. But before you head to the dealership, there are some things to do first. Modern electronic keys are more practical and convenient than traditional metal keys. They can unlock and open your car's doors, open the windows, call your car, and even park it for you. Replace the battery if your device ceases to function properly. A dead battery can cause the fob to malfunction, or cease to function completely. Fortunately, replacing the battery is a simple fix. Just remove the old battery, replace it and reinsert it. A fob that's malfunctioning could be unable to find its driver profile. This feature allows for the car to detect which driver is using the fob and adjusts car's settings in line with that. This feature is especially useful if there are multiple drivers in your household. You can purchase a replacement key fob from a different manufacturer than your one, but you have to select a key fob that is compatible with your. The fob should have a special program inside that connects to the specific vehicle's immobiliser unit. There are replacement fobs available on the internet, however they might not function as well and could damage the immobiliser. Replacement Key fobs of today do more than unlock or lock a car. They also serve as an effective deterrent to theft as well as an additional security measure. As such, they are extremely complex pieces of hardware that are costly to replace if they are lost or broken. It is possible to get an old key made from metal by locksmiths. However, the newest smart keys need to be programmed at dealerships and may cost up to 200 dollars. Fortunately that replacing the battery in the battery of your BMW key fob is simple. You can purchase a brand new battery at an auto parts store or a big-box retailer, and it will cost you less than $10. You'll have to take out your old battery carefully open the case prior to inserting the new one. Consult your owner's guide for directions, as you don't want to cause damage to the case by forcing it to open. Some of the most sophisticated key fobs will even lower your windows, summon or auto-park the vehicle. If you require an additional MINI key fob to gift your driver or a friend it may be helpful to have their own Driver Profile with it. This lets you alter their preferred settings for mirrors such as seat and climate control, and more.