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Replace Mini Key Fob Batteries If your key fob is equipped with an internal battery that requires to be replaced, it's a relatively easy and affordable fix. Make sure you are aware that you might need to reset it and activated. This will ensure that all settings on the new keyfob such as mirror positions and seat positions, are connected to your car's Driver profile. Battery Modern key fobs offer more performance and convenience over traditional car remote or flip key. This technology is not without a cost as the battery on your key fob will eventually get worn out. You could end up stranded if you wait until the battery is dead. To avoid this, replace your key fob battery whenever you begin to notice signs of weakening power. The LED light on a key fob can be used to check the battery voltage. The battery is dead when the key fob's buttons don't work when they are they are pressed. Key fob batteries are typically small coin-shaped batteries like the CR2025 or CR2032. They can be purchased at auto parts stores as well as home improvement stores and general stores. Ensure you purchase the correct type of battery, because different fobs require specific cell thicknesses. You can also use a voltmeter to measure the voltage of a fob's battery. A quality battery should have an voltmeter reading of 3 Volts. If the battery in your fob's has less than 2.8 Volts, it needs to be replaced. Removing the fob's battery is relatively 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 break any of the plastic tabs connecting the parts. Chip If your key fob won't switch on when you push the lock or unlock button, it could need new batteries. You can get a new battery for your key at a hardware store, big-box retailer, or even online. Most fob batteries are less than $10. Replace it yourself by following instructions in your manual or on YouTube. Modern electronic key fobs provide more convenience and function than traditional metal keys. They also serve as a deterrent for car theft. It's important to deactivate your key fob in the event that you lose it or break it. This will keep it from falling into the wrong hands. Key fobs have an integrated security chip that transmits an alert to your car's ignition system. This disables the immobiliser that is built in your engine control unit, and allows you to start your car without the need for a key. This feature could cost up to $300 for the key fob. Some of the more recent models come with a switchblade which houses the metal part of your car keys inside plastic. Locksmiths can duplicate these keys for less than metal keys but the dealer must program them to allow the vehicle to start. Some dealers will program it for free or at a low cost, whereas other dealers might charge. Online sites sell pre-programmed keys fobs for a small cost. However, these online retailers usually require proof of ownership from buyers prior to they can ship their product. Reprogramming If your key fob stops working, the first thought that comes to mind is that it has been damaged and needs to be replaced. Before you visit the dealer, check a few things first. Modern electronic keys offer much more convenience and functionality than a traditional key. They can open and close your vehicle's doors. They can also roll down the windows, summon your car and even park your car for you. Replace the battery when your fob isn't working properly. A dead battery can make your fob's function be affected or stop working altogether. The good news is that replacing the battery is a simple fix. Simply take out bmw mini replacement key cost g28carkeys.co.uk , replace it and then re-insert it. Another common reason for the fob to malfunction is that it has lost its driver profile. This feature allows the car to recognize which driver is using the fob and adjusts the car's settings according to the user's profile. The feature is especially useful in the event that you have more than one person in the household. You can get an alternative key fob from a different manufacturer than your own, but you must select a key fob that is compatible. The fob must have an additional program which connects to the specific immobiliser unit of your vehicle. Although you can find replacement fobs on the internet however, they will not function as well as the original ones and might even harm the immobiliser unit. Replacement Key fobs today do more than just unlock and lock the car. They also serve as security measures and a theft deterrent. As such, they're very complicated pieces of hardware that can be costly to replace if lost or damaged. Although it is possible to have an old metal key cut by a locksmith, modern smart keys must be programmed at the dealership and cost up to $200. Fortunately replacing the battery on your BMW key fob is relatively easy. You can buy a new battery from an auto parts shop or big-box retailer, and it will cost less than $10. You'll need to take out the old battery and then carefully open the case. After that, you can install the new battery. Refer to the owner's guide for instructions, as you do not want to harm the case by pushing it open. Some of the more advanced key fobs can even lower your windows, call or auto-park the car. If you need an additional MINI key fob to give your partner or another driver it is beneficial to have their own Driver Profile with it. This lets you alter their preferred settings for mirrors including seat and climate controls and more.