https://www.thekeylab.co.uk/carkeyrepair/ Key Fob Repair - Replace the Battery Key fobs last for anywhere from three to four years. If they begin to exhibit signs of being damaged, you should examine them to determine if they have been damaged and replace the battery if necessary. Many car manufacturers use a coin-shaped batteries that are available in pharmacies, grocery and hardware stores. You can also find online videos of users who explain how to replace the battery on a key fob yourself. Reduced Operational range When a key fob starts to work less reliably typically, it's due to the battery dying. There are a variety of batteries that are available to purchase and easily replaced at supermarkets pharmacies, pharmacies, or home improvement stores. Most key fobs use a lithium-ion coin or button cell battery that is easy to replace and open. Some fobs may have the battery inserted into the case. This will require an automotive technician who is experienced in removing key fob batteries. The fob has to be programmed after the battery has been replaced to function properly. Some vehicles let owners program an alternative key fob by using the owner's manual or an online source, while others require that you head to a dealership to receive this service. Mel Yu, Consumer Reports automotive analyst says that Mercedes Benz keys can only be programmed by a dealer due to the digital encryption. The operation of remote key fobs could be affected by ambient noise and other environmental factors. For example, some structures have structural steel that can absorb radio transmissions from the key fob and affect its range. This can also happen when remote keyfobs aren't controlled by drivers. If replacing the battery and having your remote key fob professionally programmed fails to resolve the issue it could be due to an even bigger mechanical issue with the key fob or its internal components. In this case you should consult locksmiths in College Park who can examine the key fo