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Changing the Battery in Your Mini Key Fob The key fob allows you to lock and unlock your vehicle from an extended distance. It can also activate your vehicle's panic button, which can deter break-ins. You can repair your device by following few easy steps. Check that the battery is brand new. Then, try removing it from the ignition and pressing the lock button three times quickly. Battery Change the battery in your key fob is one of the most straightforward fixes. The key fob is powered by a tiny coin-shaped 3V battery (CR2032 or CR2025) that is usually easy to find in general stores, home improvement shops, and even some auto parts stores. Be sure to use a brand new battery — old batteries are often not useful anymore and could damage the circuit board. You'll need to start by prying the fob open. It might be tight, but with the help of a flat screwdriver you will be able split the halves. Install the screwdriver into the seams on both sides of the fob and lift the clips that hold it. These are easily broken therefore, be careful and slow. Reassemble the fob after replacing the battery, and test to determine if it works as it should. If it's still not working try pressing the button several times and ensuring that the contacts are clear. It is also possible to test it using an additional key fob to determine whether the issue is confined to the specific key. If not then there could be a different reason for why your key fob isn't working. For instance, it could be that the button is worn out. This would cause the button to work a few times and not all the time. Interference The key fob is powered by a small transmitter that transmits the signal in a short distance to a receiver in your car. Its function is to permit your car to recognize the fob and unlock its doors when you come close to it, as well as start when you press the ignition button in. The problem is, interference can interfere with that communication. For example, if you have your second-generation Apple Pencil charged while you're holding the fob, it can stop you from unlocking the car (via iGeneration). Other electronic devices that operate on the same frequency as the fob may interfere with its signal. Garage door openers or tire-pressure monitoring devices can also be affected. It's even possible that an RF receiver inside your home might be interfering with the fob's signal however, this is difficult to diagnose without a professional test. It's possible that your key fob simply needs to be modified. This procedure will require the transmitter in your fob to be recognized by the receiver inside your Mini and a specific code is used for each pairing. Fobs typically need to be reprogrammed when they're removed or replaced, or when you purchase a new one or, in rare cases it's when a battery has been changed. Follow the instructions in the owner's manual for how to reprogram your key fob or seek assistance from a dealer. Chip that isn't working Modern electronic key fobs provide more convenience and functionality than traditional manual keys. However, they also are more prone to damage. One of the most frequent issues is a defective chip that will prevent the fob from functioning properly. Fortunately, it's usually an easy fix. If your fob is continually failing to turn on your car, this could be an indication that the chip has become malfunctioning. It is generally possible to resolve the issue by simply replacing the battery. This is a low-cost and simple solution which can be found at any hardware store or retailer. Make sure you buy a replacement battery that is compatible with the model of your vehicle to avoid any further problems. The fob should also not be exposed to water or soapy residue. Water can cause corrosion and disrupt the circuitry. If this is the case you'll need to wash the board with isopropyl or an electronic cleaner prior to installing a new battery. Once the old battery is replaced, it's a good idea to test the fob's functionality before driving the car. With a voltmeter, test the voltage of the new battery to see if it is at a safe level. If not, you may require replacing the entire remote chip. A certified technician from the dealership can help you choose the best solution for your car. Reprogramming We offer a replacement slim key fob to replace the old key fob. It functions exactly as the original, and the full fitting instructions are included with every order. We also offer our customers with a helpline. Often, mini cooper key repair -key fob will malfunction or cease to function completely. It can be frustrating when your car won't start. You have to wait until it restarts. However, reprogramming the key fob may be the solution and it's easy to accomplish. First, check to see if the battery inside the key fob is in good condition and has not been replaced. Once a new battery is installed, it is not able to be reprogrammed and would have to be replaced. Once the key fob has been programmed, it will be able to communicate with the vehicle and control all of its functions, including the radio and air conditioning system and even the windows and sunroof. It can also activate the comfort access feature which means that the door for the driver will unlock and close automatically when you enter the vehicle or the seats move up and down to let you in or out. The key fob can adjust the mirrors, the radio, and the climate control settings to suit your preference.