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Why Your Seat Leon Replacement Key Won't Work? If you're Seat Leon remote key stopped working suddenly, there are several possible causes. Some of them include: a dead battery or water damage to receiver module, radio interference and an unrepaired coin battery. Make sure to replace a lost or damaged key with the correct type and size. Also, ensure that replacement seat key is programmed to your vehicle. Dead coin battery A dead coin battery is the most frequent cause of your seat leon's key fob not working. This is easy to fix and can be done in just about a minute. However, the problem may also be caused by worn buttons, water damage, signal interference, and receiver module issues. These issues can be resolved with an OBDII scan or by reprogramming the key fob. The battery inside the key fob is an essential element of the remote keyless ignition system that is found in your Seat Leon. It has metal retaining clips to keep it in position and complete the circuit by sending power to the receiver module. The circuit can fail in the event that the clips are damaged, loose, or damaged by corrosion. Replace the battery with one with the same type size, voltage, and size to fix the issue. If the key fob has been exposed to water, it is recommended to wipe it clean using a paper towel and isopropyl alcohol. This will prevent further damage or corrosion. It is also recommended to allow the electronics to dry completely before replacing the battery. Contacts to the battery are not working properly. The key fob of your Leon features metal retaining clips that keep the battery in place and complete the circuit. If these aren't properly tensioned, it can cause problems with contact. This can also happen when you replace the battery with the wrong voltage or size. This can be fixed by replacing the old battery with a brand new one. Choose a new battery that is exactly the same size and voltage as the original. The fob can also fail due to damaged battery contacts or signal interference, water damage or a dead 12 volt battery. In this case, disconnect the 12 Volt batteries for a few seconds. After that, you can reconnect the negative and positive cables. If your Seat Leon keys don't work and you are unable to use them, it's best to call an auto locksmith professional. UK Auto Locksmith offers a range of services for car keys including reprogramming key chips. They offer competitive rates and are well-equipped to handle the needs of repairing your car keys. Faulty receiver module The key fob on the seat leon is a small device that sends signals to the vehicle. The immobilizer mechanism of the car may not function when these signals aren't received in a timely manner. This can be caused by interference from objects, poor weather conditions, or transmitters that are on the same frequency band. Key fobs can function but only in an extremely short distance. Metal clips keep the battery in within the key fob. If they are corroded or worn out the contact points might fail. You can replace the battery in your key fob easily but you must be sure that it's of the same size and voltage as the original. If your key fob can not work to start the vehicle, you may have to replace the receiver module, or the battery. The issue can be resolved by a professional at a low price. You can also modify the key fob yourself which will save you money instead of having to pay a dealership to do it. A professional can also help you with other issues, for instance the malfunctioning TIPM (transmission immobilizer control unit). They can also replace the ignition switch or sensor. Radio interference The key fob utilizes radio waves to communicate with the car, however these signals may be mangled when there is a huge amount of interference around. This can occur from broadcast towers, airplanes and even satellites. This type of interference may also affect the range of your remote. If your remote only works from a short distance Try placing it close to your chin or forehead and see if this fixes the problem. Resetting the receiver module is typically enough to fix the problem of a Leon keyfob that isn't working. This can be accomplished by taking out the battery with 12 volts for a short period of time (first the negative cable first, then the positive). After that the key fob will perform as expected. If not, you may need to visit an authorized dealer to reprogramme the. You can also employ an OBDII scan tool to identify the root of the issue. It could be that the electronic chip inside the key fob has developed a fault, that needs to be replaced. This is more likely in the event that the key fob been exposed to water or salt water.