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Changing the Battery in Your Mini Key Fob The key fob can be a convenient way to lock or unlock your vehicle from an extended distance. It can also trigger the panic button on your car that can deter burglaries. If your device ceases to function, it can be fixed by following a few simple steps. Make sure the battery is new. Remove the battery from the ignition, and then press the lock button fast three times. Battery The most straightforward way to repair the battery of your key fob is to replace it. The key fob is powered by a small coin-shaped battery (CR2032, 2025) and can be found in a variety of general stores and home improvement stores and auto parts stores. You should use a new battery. Old batteries can harm the circuit boards and are no longer useful. Start by opening the fob. You may have to use a flat screwdriver divide the two halves. Then, insert the screwdriver into the seam on all sides of the fob and lift the clips holding it in place. These are easily broken so be cautious and take your time. After replacing the battery take the fob apart and test it to see if everything is functioning exactly as it should. If it isn't working after pressing the button a few times, ensure that the contacts are clean. You could also try it using an additional key fob to determine whether the issue is specific to that particular key. If not it could be another reason for why your key fob isn't working. For example, it could be that the button is worn out. This would only make the button work infrequently and not all the time. Interference The key fob is powered by a tiny transmitter that transmits signals of a short range to a device in your car. Its goal is to enable your car to recognize the fob and unlock its doors when you approach, as well as start when you press the ignition button in. Interference may sometimes hinder communication. If you charge your second-generation Apple Pencil while holding the fob (via iGeneration) it may prevent you from unlocking the vehicle. Other electronic devices that use the same frequency as the fob could interfere with the signal. Garage door openers and tire-pressure monitoring devices can also be affected. Even a transmitter inside your home could be interfering, but this is difficult for a professional to test. It's also possible that the key fob needs to be reprogrammed. This process requires the transmitter in your fob to be recognized by the receiver inside your Mini and a distinct code is assigned to each pairing. Fobs must be reprogrammed when they are removed from the system or replaced after purchasing a new one and, in some instances, when the battery is changed. To reprogram a fob, follow the steps in the user's manual of your device or visit a dealer for assistance. Chip that isn't working Modern electronic key fobs provide more convenience and functionality than traditional manual keys. However, they are also more susceptible to damage. A faulty chip is among the most common issues that can stop your key fob from working properly. Fortunately, this is often an simple fix. If your fob is continually failing to turn on your car, this could be an indication that the chip is damaged. The issue can usually be resolved by replacing the battery which is affordable and easy to locate at a hardware store or big-box retailer. To avoid future problems make sure to purchase the correct battery with the vehicle model you are using. The fob should not be exposed to water, or soapy residue. Water will often cause corrosion, which can cause problems with the circuit board. If this is the situation you'll have to clean the board with isopropyl and electronic cleaner prior to installing the new battery. It is a good practice to test the functionality of the fob before driving the vehicle. Examine car key fob replacement of new battery with an voltmeter to make sure it's safe. If not then it may be necessary to replace the entire chip in the remote. A trained dealer technician can determine the best option for your vehicle. Reprogramming We offer a replacement slim key fob that can replace your old key fob. It functions the same as the original and complete fitting instructions are included with every order. We also offer an online customer support line. Sometimes your mini key fob will malfunction or cease to function completely. It can be very frustrating when the car will not start. It is necessary to wait until it gets back to normal. Reprogramming the keyfob is a straightforward solution. First, make sure the battery in your key fob remains in good condition and hasn't been replaced. After a new key fob battery is installed, it can't be reprogrammed. It will need to be replaced. Once the key fob has been programmed, it can communicate with the vehicle and control all its functions such as the radio as well as the air conditioning system and even the windows and sunroof. It also has the ability to activate comfort access, which means the doors for the driver will open and close automatically as you enter the car or that the seats move to help you get into and out. The key fob will then activate the climate control settings and mirrors to suit your preferences and even adjust the radio.