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How to Fix a Seat Leon Key Fob That Stops Working It can be frustrating if your key fob isn't working. There are, however, a few things you can try to solve the issue. It is simple to fix the key fob you have that is not working by replacing the coin battery. Other issues may require more complex troubleshooting, however. Dead coin battery If your key fob suddenly stopped functioning, it could be due to a dead coin-cell. It's simple and cheap to replace the battery. The steps are contained in the owner's manual. You can purchase replacement batteries at many electronic stores or your local car dealership. Make sure that the new batteries are of the same voltage and size as the original ones. If you replace a battery in error or a different one, the chip in the key fob could be damaged. Check the metal clips that are used to hold the batteries. They should be secure and not rusted or worn. They are typically made from spring steel. If they lose tension, the battery may move around and cause contact issues. In this case the keyfob may not respond when the remote control sends signals. Damage from water or signal interference as well as other issues with the receiver module can cause the key fob to stop working. If none of these solutions work, you should think about replacing the remote fob. You could also try a faraday pouch, which will shield the key fob from external electromagnetic fields. If your key fob still does not work after trying these solutions, then you must visit the dealer to reprogram the key fob. Costs will vary based on the make of your vehicle and model. Water damage Depending on how often your seat leon key fob is used, it can last between two to four years before needing replacement. If the remote ceases to function abruptly, the reason could be water damage. This kind of damage could be caused by the remote being opened or stepped on and may also cause corrosion to the circuit board. The key can also be reprogrammed in order to restore functionality, but this is best reserved for auto technicians with experience. The key fob has rubber seals that prevent water from contacting the electronic chip inside, but prolonged exposure to salty, soapy, or ocean water can harm it. Even if the chip is not damaged exposure to any type of water could cause the electronics of the key fob to fail. In some instances the buttons of the key fob can be resoldered, however this will not always work, especially when the buttons are squeezed or pulled on hard. If the key fob is submerged in water, take it off first and then clean with isopropyl the the circuit board. After thoroughly drying it then, put it back in place. If the key fob does not work after trying this then you can try a different remote control to reset the system. You can also disconnect the battery 12 volts for a couple of minutes. Be sure to disconnect the negative cable first, then the positive one. Radio interference It can be extremely frustrating, and even hazardous, if your key fob on your seat lever stops working. Key fob malfunctions are usually caused by a dead battery, however other factors could hinder signal transmission. This could be due to an antenna that is damaged or a key that is not paired, and must be changed. Remove extra transmitters from the key ring, and then test your key fob in a space that is not prone to interference. You can also reboot the computer onboard by disconnecting and reconnecting the 12 volt batteries for a few moments. If this doesn't solve the issue, it could be necessary to replace the battery. Another common cause of key fob problems is interference from accessories like LED lights. These can interfere with the RF signal used by the key fob to communicate with the car's microprocessors. Daily Mail reports that these devices are sold for as little at PS100. They are easy to use. These devices can fool proximity-sensing systems for keyless entry to believe that a key is nearby. This kind of attack happens mostly in vehicles with internet access. It is vital to stay vigilant and take appropriate precautions. Keyless entry system that isn't working properly A key fob is an excellent convenience, but it can also be a hassle if it stops working. The majority of problems that can cause the key fob in your car to stop working can be resolved. The first step is to check the battery. Often, simply replacing the batteries on your key fob will get it working again. It may also need to be reset or reprogrammed. Refer to your owner's manual for instructions on how to do this. Another issue with keys is radio interference. This can be caused from objects in the vicinity of your car or weather conditions, as well as other transmitters that use the same frequency. If you are experiencing this problem, try moving your key fob into an area where there aren't any other transmitters. If your key fob doesn't function even after changing the batteries or reprogramming, it's a possibility that the key has been damaged. This can happen if the fob is dropped or exposed to water. If the key is damaged you can either buy replacement parts from an authorized service center or bring it to a local locksmith to have it programmed for your vehicle. Make seat key fob replacement www.g28carkeys.co.uk to use a genuine BMW fob. You may end up having further issues in the near future. To avoid this it's a good idea carry an extra key fob on you at all times.