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Car Key Button Repair The buttons on car keys are exposed to a lot and are especially vulnerable if used frequently. In time, they could become damaged. There are key fob repair that will get your keys working again. These methods are not completely safe, however. Making changes to batteries or tampering with your key fob can be dangerous. If you're not confident with these methods, it's best to consult a professional auto-locksmith. Change the Battery It could be time to replace the battery in the case that your key fob isn't working as it should. You can purchase replacement batteries at any national chain drugstore or in the parts department at your local car dealership. Some manufacturers will even include a spare key fob battery inside the packaging when you purchase your car from them. First, you'll need to find out the kind of battery is used in your key fob. The manufacturer may have this information on their website, or you can check the actual key fob. The most common kind of battery that is found in keyfobs is the button cell, which is like the ones found in watches and remotes. These kinds of batteries are commonly found at stores such as Walgreens and Energizer and are available for less than $5 for a pack of two. You can remove the old battery from your key fob when you know the type of battery it has. You can open most key fobs by using your fingers or a flat tool, like a screwdriver at the notch or seam where they connect. After the fob has been opened, the battery should be able to pop out and you can then insert the new one in the same direction as the old one. The majority of key fobs are powered by CR2032 3V batteries, which are available at many stores that sell AAA and AA batteries. You can join the two halves together after you have inserted the new battery and test the key fob to confirm that all buttons work correctly. You can verify that everything is working properly by pressing the lock and unlock button on the key fob, while pointing it at your vehicle. If your vehicle still isn't responding to the fob, you might need to reprogram the fob to establish wireless connectivity. Luckily, this is quite simple and only requires the use of your smartphone or another device to do so. Reprogram your key fob If you're experiencing issues with your key fob, and you think it needs a new one however, it may not be required to replace it. Instead the old battery might require reprogramming. This procedure is different for every car, so your best bet is to consult the owner's manual (usually available in PDF form on the site of the automaker) or search YouTube for videos on how to accomplish this. In the majority of modern vehicles, a specific procedure is required to put the vehicle in 'programming mode'. This usually involves pressing the power button a few times on the door of the driver or ignition while simultaneously pressing a button on a fob within the time frame specified. This is how the fob sends its digital identity code to the car, which saves it in its memory. The fob can function as an ordinary key once it has been programmed. Reprogramming a keyfob erases any previous keyfobs. If you wish to keep the other fobs after the first, they should be reprogrammed swiftly and carefully. You can sometimes find replacement batteries for a car key fob at hardware stores, big-box retailers, or on the internet. You must be aware of your car's model and make before you purchase a key fob since it can be difficult to locate the correct battery. A CR editor found the battery for her key fob, however, it came from an entirely different vehicle. This meant she could start her car and open the door, but couldn't lower the windows. Luckily, dealers can help in this situation, as most of them have the equipment needed to reprogram a fob for a specific car. Some European vehicles, such as the ones manufactured by Audi and BMW generally require you to go to a dealer to get this service because they use specific security features that can only be reset by the manufacturer. Other dealers we spoke with like those from Toyota and Lexus, were willing to attempt reprogramming the fob in a replacement as long as you knew the exact model and make of your car. Replace the Button If you have tried changing the battery and programming the key fob and still not being able to start your car, it might be time to replace the button on your key. Your car key button receives lots of use and jostling over the years and may get stuck or damaged. Each press of the button on your car key fob generates a unique code in a sequence that is recognised by the car's receiver. If you attempt to operate your car from a distance without using the correct code can cause it to not be able to recognize you and shut the doors or shut off the engine. You can buy replacement buttons online or in numerous local hardware stores. They are fairly easy to open up and install and require only a small amount of clear plastic tape to cover the button. Contact an Auto Locksmith It may be time to speak with a professional if you are experiencing problems with the key button on your car. Auto locksmiths specialize in the repair of electronic car keys as well as their associated locks. These experts are equipped with the tools and knowledge to determine and fix issues with your key fob. This includes replacing batteries and changing the programming. They are equipped with the knowledge and skills to handle more complicated tasks, such as fixing a broken key or cutting a replacement key. One of the most common reasons for a car key switch to stop working is because the switch inside has worn out. This is due to excessive use and exposure to elements. The switch is made of an extremely hard plastic with several switches on its surface. Each of these switches is responsible for activating a specific function you are using the key to activate. As the switch age it becomes more difficult to turn on these functions. You will need to apply more pressure to the switch in order to activate it. This could result in more damage to the switch, thereby diminishing its life span. Replace the battery in your key fob. You can easily find lithium-ion button or coin cell batteries in supermarkets, pharmacies and home improvement stores. Your key fob should now work once you have replaced the battery. If the problem persists it could be because your key fob's contacts have worn out. The contacts are made of rubber and coated with an electrically conducting film that can wear out over time. They are exposed to elements while you use the key which means they are constantly exposed to moisture and dirt. Over time, they get worn down to the point where they no longer make contact with the circuit board or the sensor beneath the keypad. You can attempt to get the key fob replaced by going to an auto dealer, but this could be expensive and can take quite a while. You can also contact an expert locksmith in your area who will repair your key fob at a lower price.