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Changing the Battery in Your Mini Key Fob The key fob can be a convenient method to lock and unlock your car from some distance. It can also activate the panic button on your car which can deter break-ins. You can repair your device by following a few steps. Ensure that the battery is new. Remove the battery from the ignition, and then press the lock button quickly three times. Battery The most straightforward way to repair the battery in your key fob is to replace it. The fob has a small coin-shaped battery (CR2032, the CR2025), which is easily found in most general stores, home improvement stores, and auto parts stores. You should use a new battery. Old batteries can damage the circuit boards and become less useful. You'll want to start by prying the fob open. You may have to use a flat screwdriver separate the halves. Then, fit the screwdriver in the seam on all sides of the fob and lift a couple of clips that hold it in place. These are easily broken, so be careful and work slowly. After replacing the battery then reassemble the fob and check to see if everything is working as it should. If it doesn't work after pressing the button multiple times, check that the contacts are clean. You could also try it with a spare key fob to determine if the issue is specific to your key. If replacement mini key fob isn't the case, there could be another reason that the key fob isn't working. For example it could be because the button is worn out. This could make the button function occasionally and not all the time. Interference The key fob has an insignificant transmitter to send a short-range radio signal to a receiver in your car. Its goal is to enable your car to recognize the key fob, unlock its doors when you come close to it and start when you press the ignition button. Interference may sometimes hinder communication. For instance, if you are using 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 may also interfere with the fob's signal. Garage door openers, or tire pressure monitoring devices may be affected. Even a transmitter inside your home could be causing interference with the tire pressure, but this would be difficult for professionals to test. It's possible that your key fob simply needs to be reprogrammed. The transmitter inside your key fob has to be recognized by the Mini's receiver. A unique code is then created for each pairing. Fobs must be reprogrammed after they have been disconnected or replaced, either after you purchase a replacement and in certain cases when the battery is changed. Follow the steps in the owner's manual for how to reprogram your key fob or consult a dealer. Chip that is not working Modern electronic key fobs offer convenience and performance over traditional manual keys, but they are also susceptible to being damaged. A malfunctioning chip is one of the most frequent problems that can stop your key fob from working correctly. Luckily, this is usually an simple fix. If the car key fob fails to turn on it could be an indication of a faulty chip. The issue can be solved by replacing the battery which is inexpensive and easy to find at an hardware store or big-box retailer. To avoid any further issues, make sure you purchase an appropriate battery for the car model you have. It is also crucial to ensure that the fob is not exposed to soapy residue. Water can cause corrosion and interfere with the circuitry. If this is the case, you will need to clean it by using isopropyl or electronic cleaner prior to putting in an entirely new battery. It is a good idea to test the operation of the fob prior driving the vehicle. With a voltmeter, test the voltage of the new battery to see whether it's at an acceptable level. If not, you might have to replace the entire remote chip. A certified technician from the dealership can help you determine the best solution for your car. Reprogramming We have a brand new key fob that can be used as a replacement to replace the previous one. It operates exactly the same way as the original key fob, complete fitting instructions are included with each order and we also have a helpline for all customers. Often, your mini key fob will malfunction or stop working completely. This can be due to a variety of reasons and can be stressful as the car will not start, and you have to wait for the car to start again. However, reprogramming your key fob could be the solution and is simple to do. The first thing to do is ensure that the battery for the key fob is in good condition and has not been replaced. After a new key fob battery is installed, it can't be reset. It will have to be replaced. Once the key fob is programmed, it will be capable of communicating with the car and control all of its functions, including radio, air conditioning and even the windows and sunroof. You can also enable the comfort access feature which means that the door for the driver will be locked and closed automatically when you enter the vehicle or the seats be able to move up and down to let you in or out. The key fob will then enable the climate control settings and mirrors to suit your personal preference and it can even adjust the radio.