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How to Fix a Seat Leon Key Fob That Stops Working It can be frustrating if your key fob stops working. There are a few things you can do to solve the issue. You can fix the key fob that is not working by replacing the coin battery. Other issues could require more sophisticated troubleshooting however. Dead coin battery If your key fob stops working out of the blue it could be due to a dead battery for the coin. It is easy and inexpensive to change the battery. The instructions are in the owner's manual. Many electronic stores and local auto dealerships carry batteries that can be replaced. The new batteries should be the same size and power as the original ones. The chip in your key fob could be damaged If you replace the battery in error or with a different type. Check the clips made of steel that keep the batteries in place. seat replacement car key should be tight and not worn or rusted. They are typically made of spring steel. If they lose tension, the battery might move around and cause contact issues. In this case the key fob may not respond to signals from the remote control. Water damage signals interference and other issues with receiver module could cause the key fob's functionality to cease. If none of these options work you need to replace the remote key fob. You could also try faraday pouches, which will shield the key fob from external electromagnetic fields. If your key fob will not work after attempting these fixes, then you should go to the dealer to change the programming of the key fob. The cost for this service may vary depending on the brand and model of the vehicle you own. Water damage Depending on the frequency you use your seat leon keyfob, it can last between two and four year before it has to be replaced. If the remote stops working suddenly, the reason may be water damage. This kind of damage can occur when the remote is removed or stepped on and may also cause corrosion to the circuit board. The key can also be reprogrammed in order to restore its functionality, but this process is best reserved for auto technicians with experience. The key fob has rubber seals that prevent water from getting to the electronic chip inside, however prolonged exposure to salty, soapy or ocean water could cause damage to it. Even if the chip is not damaged exposure to any form of water can cause the electronics of the key fob to fail. In some instances the keys of the key fob can be resoldered, but it isn't always successful, especially if the buttons are pressed or pulled with force. If the key fob has been submerged in water, first take the battery off and scrub the contacts on the circuit board with isopropyl alcohol. After drying it thoroughly, reinstall the battery. If the key fob does not work after this procedure, you can use an alternative remote control to reset the system. You can also disconnect the battery 12 volts for a few minutes. Be sure to disconnect the negative cable first, and then the positive cable. Radio interference It can be frustrating, and even dangerous, if the key fob on your seat leon fails to function properly. Key fob malfunctions are usually caused by a dead battery, but other causes can cause interference with the transmission of signals. They could be caused by an antenna that is damaged, an unpaired key that needs to be reprogrammed or an inoperable receiver module. You can resolve many of these issues by removing any transmitters that are not needed from your key ring, and testing the key fob in an area that is free of interference. Try to restart the computer that is on your key fob by disconnecting the 12 volt battery for a few minutes before reconnecting it. If this doesn't fix the issue, you may require replacing the battery. Another cause of key fob problems is interference from accessories like LED lights. They can interfere with the RF signal that the key fob uses to communicate with the car's microprocessors. Daily Mail reports that these devices are sold for as little as PS100. They are easy to use. These hacking devices are used to trick proximity sensors of keyless entry into believing that a key is just to. This type of attack is most common in connected cars with internet access. It is important to be aware of these risks and take precautions. Keyless entry system that isn't working properly Key fobs can be an amazing convenience, however it can also be frustrating when it stops working. Fortunately, the majority of problems that make a car's keys fob to stop responding can be easily resolved. Make sure the battery is checked first. Most of the time, replacing the batteries on your key fob will get it working again. It may also need to be reset or reprogrammed. Consult your owner's guide for the correct procedure. Radio interference is another frequent problem with key fobs. It can be caused by objects near your car or weather conditions, or other transmitters operating on the same frequency. If you're experiencing this problem, try moving your key fob in an area that is free of other transmitters. If the key fob you have isn't function after changing the batteries or reprogramming, it's likely 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 buy replacement parts from an authorized service center or bring it to a local locksmith to have it programmed for your vehicle. But, you must always use a genuine BMW key fob. It is possible to have more issues in the future. It's a good idea always carry a spare keyfob.