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How to Fix a Seat Leon Key Fob That Stops Working The key fob is a wonderful convenience in your seat leon but it can also be frustrating when it does not work. There are, however, a few options you can use to resolve the issue. Often, the problem with your key fob is usually a dead battery for the coin, which you can replace in a couple of minutes. Other issues may require more complex troubleshooting, however. Dead coin battery If your key fob suddenly stopped working it could be due to a dead coin-cell. The battery replacement process is cheap and easy. Your owner's guide will provide the steps. The replacement batteries are available at the majority of electronic stores, or at the local dealership for cars. The replacement batteries must be identical in size and voltage as the originals. The chip in your key fob could be damaged If you replace the battery incorrectly, or with another type. Check the metal clips that keep the batteries in place. These clips should be tight, and not worn out or rusted. They are typically made of spring steel. If they lose tension, the battery may move around and cause contact problems. In seat leon key fob G28 Car Keys will not respond when the remote control sends signals. Damage from water signals interference and other issues with the receiver module can cause the key fob's functionality to cease. If none of these options work you need to replace the remote key fob. You can also try using faraday pouches, which will shield the key fob from electromagnetic fields. If the key fob still does not work after these solutions then you should consult your dealer about reprogramming the remote key fob. The cost will differ based on the make of your vehicle and model. Water damage Depending on the frequency you use your seat leon keyfob, it could last anywhere between two and four year before it needs to be replaced. Water damage can be the cause of a remote that suddenly ceases to function. This kind of damage could be caused when the remote is opened or accidentally stepped on. It can also cause rust to the circuit board. The key can also be reprogrammed to restore the functionality, but this is best left for professional auto technicians. The key fob's rubber seals to prevent water from contacting the electronic chip inside, however prolonged exposure to soapy, salt, or ocean water can damage it. Exposure to any type of water can cause the key fob's electronics to fail, even when the chips aren't damaged. In certain cases the buttons on the key fob can be resoldered, but this is not always the case particularly when the buttons are squeezed or pulled with force. If the key fob was submerged in water for a while, remove the battery and clean the contacts on the circuit board using isopropyl alcohol. Then, dry it thoroughly before reinstalling the battery. If the key fob doesn't work Try using a different remote to reset the system. You can also disconnect the 12 volts battery for a few seconds. Make sure to disconnect the negative cable first before you disconnect the positive one. Radio interference If the key fob in your seat leon ceases to function, it can be frustrating and even risky. Key fob issues are typically caused by a dead battery, but other causes can hinder signal transmission. This can be caused by an antenna that is damaged or a key which is not paired and has to be changed. Remove any additional transmitters from the key ring, then test your key fob in a place that isn't subject to interference. Try to reboot the on-board computer by removing the 12 volt battery for a few minutes before reconnecting it. If this doesn't fix the issue, you might have to replace the battery. Another reason that can cause key fob issues is interference from additional accessories, such as LED lights. These can interfere with signals from RF that are used by the keyfob to communicate with car microprocessors. Some of these devices are available for just PS100 and are simple to use according to the Daily Mail. These hacking devices can trick proximity-sensing keyless entry systems into thinking a key is near. This type of attack occurs typically in vehicles with internet connectivity. It is important to be vigilant and take appropriate precautions. A faulty keyless entry system While a key fob is an incredible convenience, it can also be frustrating when it stops working. Most of the issues that result in the key fob of your car to not function can be solved. Make sure the battery is checked first. Often, simply replacing the batteries in your key fob will get it working again. It may also have to be reset or reprogrammed. Refer to the owner's manual for the correct procedure. Radio interference is a common problem with key fobs. This can be caused by objects near your vehicle and weather conditions. It can also be caused by other transmitters operating on the same frequency as your key fob. If you are experiencing this problem, try moving your key fob in an location where there aren't other transmitters. If your key fob does not work even after changing the batteries or reprogramming, it's possible that the key has been damaged. This can happen if the fob is dropped or exposed to water. If your key is damaged, you can buy an alternative one from a certified service center or take it to a locksmith to have it programmed for your vehicle. Make sure to use genuine BMW fob. Otherwise, you may run into additional issues in the future. It's a smart idea to always have a spare keyfob.