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How to Fix a Seat Leon Key Fob That Stops Working The key fob can be a great convenience for your seat leon but it can also be frustrating when it does not work. There are a few steps you can do to fix the issue. Most of the time, the issue with your key fob is a worn-out battery that you can replace in a few minutes. Other issues could require more complex troubleshooting, however. Dead coin battery If your key fob suddenly stopped functioning it could be due to a dead battery in the coin-cell. Change the battery is affordable and simple. seat leon spare key cost are in the owner's manual. Many electronic stores and local auto dealerships carry batteries that can be replaced. The replacement batteries must be identical in size and voltage like the original ones. The chip inside the key fob may be damaged If you replace the battery in error or with a different type. It's also important to check the retaining clips made of metal that keep the battery in place. They must be strong and not rusted or worn. They are usually made from sprung steel. If they lose tension, the battery could shift and cause contact issues. In this case the keyfob will not respond when the remote controls transmit signals. The key fob could also malfunction due to damages to the water or signal or other issues with the receiver module. If none of these work you need to replace the remote key fob. You could also consider using a faraday bag to protect the key fob from external electromagnetic fields. If the key fob still fails to function after these fixes it is recommended that you visit your dealer to reset the remote key fob. The cost will depend on your vehicle's make and model. Water damage Depending on how often your seat key fob from Leon is used, it should last between two to four years before needing replacement. Damage to the water supply could be the cause for a remote that suddenly ceases to function. This type of damage can be caused by the key being opened or was stepped on, and can also cause corrosion to the circuit board. The key could also be reprogrammed to restore its functionality, but this procedure should be left for professional auto technicians. Rubber seals on the key fob prevent water from reaching the electronic chip, however prolonged exposure could damage it. The exposure to any kind of water can cause the electronics of the key fob to fail even if the chips are not damaged. In certain situations the keys of the key fob could be soldered again, but it isn't always successful, especially when the buttons are squeezed or pulled on hard. If the key fob was submerged in water, first remove the battery and clean the contacts on the circuit board using isopropyl alcohol. Dry it thoroughly before reinstalling battery. If the key fob does not work after trying this alternative, you can use an alternative remote control to reset the system. You could also try disconnecting the 12 volt battery for several minutes. Make sure to disconnect the negative cable first, and then the positive cable. Radio interference If the key fob of your seat leon ceases to function it can be frustrating and even risky. Key fob malfunctions are usually caused by a dead battery but other causes can hinder the transmission of signals. They could be caused by a damaged antenna or key that is unpaired and needs to be reprogrammed, or a malfunctioning receiver module. Remove extra transmitters from the key ring and test your key fob in a place that is not prone to interference. You could also try to reboot the onboard computer by disconnection of the 12 volt battery for a couple of minutes and then reconnecting it. If this fails to fix the issue, it may be necessary to replace the battery. Another cause of key fob problems is interference from accessory devices like LED lights. They can interfere with the RF signals that the keyfob uses to communicate with the car's microprocessors. Daily Mail reports that these devices are sold for as low as PS100. They are also simple to use. These devices can fool proximity-sensing systems for keyless entry to believe that a key is near. This kind of attack is usually found in connected cars with internet connectivity. It is important to be aware of the risks and take precautions. Keyless entry systems with malfunctions While a key fob is an amazing convenience, it can also be frustrating when it stops working. Fortunately, most problems that can cause a car's key fob to stop working can be easily solved. First, check the battery. It is often enough to replace the batteries in your keyfob to allow it to be working again. It may also need to be reset or changed. Check the owner's manual for specific instructions. Radio interference is another frequent problem with key fobs. This could be due to objects in the vicinity of your car or weather conditions, or other transmitters that operate on the same frequency. If you're experiencing this issue Try relocating the key fob or attempting to operate it in areas where there aren't any other transmitters nearby. If your key fob still doesn't work after changing the batteries and reprogramming it there's a good chance that the key has been damaged. This could happen if the fob is dropped or exposed to water. If your key is damaged you can either purchase the replacement from a reputable service center or take it to your local locksmith to have it programmed for your vehicle. Be sure to use authentic BMW fob. It is possible to have more issues in the future. It's a good idea always have an extra keyfob.