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Car Key Fob Repair - How to Get Back on the Road Even If Your Keyless Entry isn't WorkingKey fobs can experience problems with time, like a loss of functionality. While some issues may require professional attention, the majority can be fixed at home.The battery replacement is usually the first step. Most fobs utilize batteries with a flat design that are readily available at hardware stores or auto parts stores.Dead BatteryWhen a key fob battery fails, it can be a major inconvenience, especially if you're away from home. However, there are options to get back on the road when your car's keyless entry isn't working.One of the first things to check is whether the buttons on the key fob work. If they do, then the problem may lie with the car's locks instead of the fob.If your keys won't unlock, you might find a mechanical slot in the trim around your door handles or on your vehicle (consult the owner's manual). Insert the mechanical key and try again. If this doesn't work certain cars come with an app that can open doors remotely. FordPass Connect, myChevrolet Mobile App and myMazda apps, for instance allow owners to open their doors with their smartphones. However, these apps have a monthly cost.Also, make sure whether your key fob won't drain the batteries of your car by resting on them. A dead fob will drain your battery fast, especially if it is used to control your phone or TV while you are watching.Holding the key fob up to your car's start button may cause the key fob that has a low battery. This quick fix can save you from a trip to your dealer or Interstate All Battery Centers.If your key fob does not work You can test it in a car with an electronic starter button. If it doesn't work the battery of the fob requires replacement. It's a great idea to keep a spare key fob in your backpack or purse.Damaged ButtonsIt's possible that your key fob has a damaged button. Your key fob is likely to have circuit boards with "contact pads" for each button, and these tiny pads are coated with an electrically conducting film that wears away over time. This wear can cause your fob to react less quickly, or not respond at all.The good news is that the contact pad in the key fob of a car is simple to replace and can be done so by using a flathead screwdriver. However, if the key fob is severely damaged or smashed in any way, it might be more difficult to open up the case, and you'll need to take the fob into an auto repair shop for repairs.It's not uncommon for a key fob to be dropped on hard surfaces, walked on, or exposed to water. All of these can cause physical damage to the keys, such as bending or snapping them.It can also cause internal damage to the fob, which could lead to a malfunction. This is why it's an ideal idea to keep a spare key fob inside your purse or pocket in the event that you damage the one you own.Check the battery first to determine if the buttons on your key fob aren't responding in the way they should. Remember that key fobs aren't any special type of electronic device - most of them run on the same batteries for two dollars that are used in hearing aids and watches that are readily available at hardware stores, drug stores, and online.If the battery is functioning properly it is possible that the buttons are worn or dirty. You can easily clean them using a damp cloth. If the buttons still don't work, try an alternative car key fob. This will help determine whether the issue is yours or a specific model. If the other key fob is working, then yours might need to be reset or replaced.ReprogrammingThe hidden world of fobs for car keys is more complicated than most myths suggest. The basic fobs operate by using unique radio frequency signals that are assigned to specific vehicles. The fobs must be programmed correctly in order for them to unlock and start the car. Unfortunately it's not as easy as pressing a few buttons, and with only a few exceptions it has to be done by the dealer.Check the owner's manual for detailed instructions. Certain manufacturers, like Mercedes, use proprietary technology that ensures only the dealership can create a new fob and re-sync it to your vehicle. However some independent shops offer this service as well, so be sure to review reviews and prices prior to selecting the right shop.Certain car models erase all other fobs if they are changed. This means you'll need to have any additional fobs programmed by an expert. This can be expensive, especially if your fob is no longer working. It is always advisable to have at least one spare mechanical key that you can use to unlock the trunk and doors even if it's not able to start the car.Be prepared for a difficult experience if you decide to reprogram your fob by yourself. There are numerous guides available online that promise success, but you'll likely be disappointed. Many of these guides were created by people who have no prior experience in this field and often are founded on unsubstantiated claims. Some of these guides claim that you can easily program your car key fob by yourself in just a few clicks. This is misleading.Most key fobs are held by a plastic clip that is easy to remove however, the battery is within the circuit board, so you'll have to carefully pry it out using a tool. You should be able to find the button battery. It's usually a small battery for a watch that can be purchased at any pharmacies or home improvement stores. It's usually simple to replace the battery. Before replacing the entire unit, you can try replacing the button cell first.ReplacementThere are many methods to fix a broken or malfunctioning car key fob. A quick fix can be as simple as replacing the battery or changing the program on the key fob, however a more extensive repair may be required. It can also be helpful to have a spare key fob in case one is lost or stolen.The majority of modern key fobs have a small physical key, in addition to the electronic components, making them both pricier and more difficult to replace than traditional keys. Some "smart" fobs come with a remote starter. It's therefore important to understand that it could take up to an hour for an alternative key fob cut and programmed to your vehicle.Fobs communicate with the car receiver using a small radio transmitter that is mounted on circuit boards. Pressing car key and repair will activate the transmitter, and it transmits an RF signal unique to the car's receiver. The receiver detects the signal and checks it against preprogrammed codes. This allows the driver to open the vehicle and begin it from a distance without putting the key in the ignition or turning the lock.If the buttons on your key fob do not respond or operate intermittently it could indicate that they have been damaged due to water or other elements. It is possible to fix the fob by taking it apart and inspecting for any broken or non-responsive buttons. If try what she says doesn't resolve the issue, try reprogramming the fob or purchasing an entirely new fob.You should check with an auto dealer in your area or a locksmith before purchasing a replacement keyfob online to make sure it's compatible with the security system of your vehicle. Aftermarket fobs can be cheaper however, you must study the reviews and brands before attempting to program them yourself. While certain fobs can be repaired by a reputable locksmith others require specialized programming equipment that can only be used by a car dealer or auto technician.