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How to Fix a Seat Leon Key Fob That Stops Working It can be very frustrating if the key fob you have been using stops working. There are a few things you can do to resolve the issue. You can easily fix the key fob not working by replacing the battery. Certain issues might require more sophisticated troubleshooting. Dead coin battery If your key fob suddenly stopped working it could be due to a dead coin-cell. It's cheap and easy to replace the battery. The steps are included in your owner's manual. You can purchase replacement batteries at the majority of electronic stores, or at the local dealership for cars. Make sure that the batteries you purchase are of the same voltage and size as the original ones. The chip inside the key fob may be damaged in the event that you replace the battery improperly, or with the wrong type. Check the metal clips that secure the batteries. They should be strong, and not rusted or worn. They are usually made from sprung steel. The battery may move in the event of a loss of tension. This can lead to contact issues. In this scenario, the keyfob will not respond when the remote controls sends signals. Water damage or signal interference as well as other issues with the receiver module may cause the key fob to cease working. If TheKeyLab of these solutions work then it's time to replace the remote key fob. You could also try faraday pouches that will shield the key fob from external electromagnetic fields. If the key fob still isn't working after these fixes it is recommended that you consult your dealer about reprogramming the remote key fob. The cost of this service will differ dependent on the make and model of your vehicle. Water damage Based on the frequency with which your seat leon key fob is used, it will last between two to four years before needing replacement. If the remote stops functioning suddenly, the cause may be water damage. This kind of damage could occur if the remote is opened or stepped on and may cause corrosion to the circuit board. It is possible to reprogram the key to restore function. However, this is best left to auto technicians who are trained professionals. The key fob's rubber seals to prevent water from getting to the chip inside, however prolonged exposure to soapy, salt, or ocean water can cause damage to it. Even if the chip is not damaged exposure to any type of water can cause the electronics of the key fob to fail. In some cases the buttons on the key fob can be resoldered, however this will not always work particularly when the buttons are pulled or pulled with force. If the key fob has been submerged in water, you must first remove the battery and clean the contacts on the circuit board using isopropyl alcohol. After drying thoroughly, reinstall the battery. If the key fob won't function after trying this option, you can try using a different remote control to reset the system. It is also possible to disconnect the battery with 12 volts for several minutes. Remove the negative cable prior to the positive. Radio interference It can be extremely frustrating, and even risky, if the key fob in your seat lever stops working. Key fob problems are usually caused by a dead battery but other factors can also hinder the transmission of signals. This can be caused by a damaged antenna or a key that's not paired, and must be changed. Remove any extra transmitters from the key ring, then test your key fob in a place that isn't subject to interference. You can also reboot the computer onboard by disconnecting and reconnecting the batteries with 12 volts for a short period of time. If this doesn't solve the problem, it may be necessary to replace the battery. Additional accessories like LED lighting can cause key fob issues. They can interfere with signals that is used by the key fob to communicate with the microprocessors in the car. Some of these devices can be purchased for as little as PS100 and are easy to use, according to the Daily Mail. These devices are used to fool proximity-sensing systems of keyless entry into believing that a key is close to. This kind of attack is usually found in connected cars with internet access. It is essential to be aware and take preventive measures. Faulty keyless entry system A key fob is a great convenience, but it can also be a hassle when it stops working. The majority of issues that can cause the key fob in your car to cease working can be solved. First, make sure the battery is in good condition. Often, simply replacing the batteries on your key fob will make it work again. It might need to be reset, or reprogrammed. Look up the manual of your owner for instructions on how to do this. Another issue with keys is radio interference. This can be caused by objects in your vehicle, weather conditions, or other transmitters that operate on the same frequency. If you're experiencing this problem, try moving your key fob into an area that is free of other transmitters. If your key fob won't work even after changing the batteries or reprogramming, it's likely that the key has been damaged. If the fob was dropped or exposed to water, this can happen. If your key has been damaged you can either buy the replacement from a reputable service center or bring it to a locksmith to have it programmed to your vehicle. Be sure to always use the genuine BMW key fob. You could end up with further issues in the near future. It's a good idea always have an extra keyfob.