https://www.saludcapital.gov.co/sitios/VigilanciaSaludPublica/Lists/Contactenos/DispForm.aspx?ID=756292 Key Fob Repair - Replace the Battery Key fobs typically last three to four years. When they start to show signs of wear, it's a good idea to examine them for damage and to consider a battery replacement. Fortunately, most car manufacturers utilize coin-shaped batteries that are available at pharmacies, grocery stores, and hardware stores. You can also find videos online of users who explain how to replace a key fob battery yourself. Reduced Operational Range It's most likely that the battery is dead when a key fob stops working reliably. There are different kinds of batteries for key fobs to be found at pharmacies, supermarkets, and home improvement stores that can be purchased and easily replaced. Most key fobs use lithium-ion button or coin cell battery that is fairly easy to replace and open. Certain fobs might include the battery in the case. This requires an automotive technician experienced in removing key fob batteries. The fob has to be programmed after the battery has been replaced in order for it to work correctly. Some vehicles let owners program an alternative key fob by using their owner's manual or an online resource, while others require that you head to the dealership to receive this service. For instance, Consumer Reports' automotive analyst Mel Yu explains that Mercedes-Benz keys must be ordered directly from the manufacturer and can only be programmed at a dealer because of the digital encryption used to secure the keys. The operation of remote key fobs may also be affected by ambient sound and other environmental factors. Certain buildings, like, have structural steel which can absorb radio signals and interfere with the range of keyfobs. This can also be an issue with remote key fobs that aren't being operated by the driver. If the issue continues to persist after replacing the battery, or having the remote's keyfob programed professionally, i