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Car Key Button Repair The buttons on keys for cars are subject to a lot of pressure and are especially vulnerable if used frequently. This can result in them becoming faulty over time. There are a few easy fixes that will allow your keys back in working order. These solutions are not completely safe, however. Altering batteries or altering the key fob could be dangerous. If you're not confident with these methods, it is recommended to seek advice from a professional auto-locksmith. Change the Battery It's possible to change the battery if your key fob doesn't function as it should. You can usually find replacement batteries from any chain drug store or in the parts department of your car dealership. Some manufacturers will even include a spare key fob battery in their packaging when you purchase your car from them. You will first need to determine the kind of battery is used in your key fob. This information is typically found on the site of the manufacturer or by checking the key fob. Generally speaking, the most popular battery that is used in key fobs is a button cell type, similar to those used in watches and remote controls. These types of batteries are available at stores like Walgreens and Energizer, and are available for purchase for under $5 for a package of two. You can remove the old battery from your key fob once you know what kind of battery it is using. It is possible to open most key fobs by using your fingers or a flat tool, like a screwdriver at the seam or notch where they join. After the fob has been opened, the battery should be able to pop out and you can insert the new one with the same orientation that the old one. A lot of key fobs are powered by CR2032 batteries. These batteries are sold at retailers that sell AAA or AA batteries. You can join the two halves together after inserting the new battery and then test the key fob to confirm that all buttons function properly. You can verify that everything is working properly by pressing the lock and unlock buttons on the key fob, while pointing it towards your vehicle. If your car doesn't respond to the fob, you might have to reset the fob to establish a wireless connection. This is a easy process that requires a phone or other device. Reprogram the Key Fob If you're experiencing issues with your key fob, and you think that it's time to get a new one, it might not be necessary to replace it. Instead the battery you have may need to be reprogrammed. This procedure is different for every car, so your best bet is to read the owner's manual (usually available in PDF format on the automaker's website) or look on YouTube for videos on how to do this. In modern vehicles, a particular procedure is required to put the vehicle in 'programming mode'. This usually involves pressing the power button several times on the door of the driver or ignition, while simultaneously pressing the button on the fob within a time-specific period. This is how the fob transmits its digital identity code to the car, which saves it in its memory. After the fob is programmed, it can function like an ordinary key. Reprogramming a keyfob will erase any previous keyfobs. Therefore, if you want to keep other fobs, they need to be reprogrammed with care and speed following the initial one. You can sometimes find replacement batteries for your key fob for your car at hardware stores, big-box retailers or on the internet. It is important to know the make and model before you purchase a fob because it isn't easy to locate the correct battery. A CR editor discovered an battery for her key fob, however, it was from a different vehicle. This meant she was able to start her car and unlock the door, but she couldn't lower the windows. Fortunately, dealers can help in this situation, as most of them have the tools needed to reprogram a fob for a specific car. Some European cars, such as those made by Audi and BMW generally require you to go to an authorized dealer for this service because they use specialized security features that can only be reset by the manufacturer. Other dealers we spoke to such as those at Toyota and Lexus, were willing to attempt reprogramming the fob in a replacement as they knew the exact model and make of the vehicle you are driving. Replace the Button If you've tried changing the battery, reprogramming your key fob, and still haven't been able to start your car it could be time to replace that button on the key. Your car key button receives a lot of use and jerking over time and can get stuck or even broken. Each time you press the button on your key fob, the unique code is sent in a sequence that the receiver inside the vehicle is able to recognize. If you attempt to operate your car from a distance without using the correct code can cause it not to recognise you and lock the doors or shut off the engine. You can buy replacement buttons online or in many local hardware stores. It is easy to install buttons and they are extremely simple to open. Contact an Auto Locksmith It may be time to seek out the experts when you're having issues with your car's key button. Auto locksmiths specialise in the repair of electronic car keys as well as their associated locks. They have the expertise and tools necessary to diagnose and fix a variety of issues with your key fob, including replacing batteries and changing the programming. They have the knowledge and expertise to tackle more complicated tasks, such as repairing a broken key or cutting a replacement key. One of the most common reasons for a car key button to stop working is because the switch inside has worn out. key repair for car and exposure to elements are the primary causes. The switch is made of hard plastic and has multiple switches on its surface. Each switch is able to activate the function that you select with the key. As the switch wears out over time, it becomes more difficult to turn on each of these functions. You will need to exert more pressure on the switch in order to make it work. This can further damage the switch and decrease its lifespan. Replace the battery in your key fob. You can easily find lithium-ion button and coin cell batteries at supermarkets, pharmacies and home improvement stores. Your key fob will work once you have replaced the battery. If the problem persists it could be because your key fob's contacts have been worn out. The contacts are rubber-like and coated with an electric conducting film, which could wear down over time. They are exposed to elements as you use the key which means they are constantly exposed to dirt and moisture. Over time, they become worn until they are no longer in contact with the circuit board or the sensor beneath the keypad. You can attempt to get the key fob replaced by visiting a car dealership, however this can be expensive and could take an extended time. The other alternative is to contact a local car locksmith who can fix your key fob and save you money.