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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped working at a sudden point, there are a number of possible causes. They could be caused by the battery of your coin is dead, water damage, receiver module problems, and radio interference. Before replacing a lost key ensure that the replacement key is the right size and type. Also, ensure that the new key is programmed to your vehicle. Dead coin battery A dead battery for your coin is the most frequent reason for your seat leon's key fob not working. It is a simple fix that takes only just a few minutes. However, seat spare key could also be caused by damaged buttons, worn buttons or signal interference, as well as receiver module issues. These issues can be addressed with an OBDII scan tool or by reprogramming the key fob. The coin battery that is located in the key fob of your Seat Leon is a very crucial component of the remote keyless system. It has metal retaining clips that hold it in place and complete the circuit by sending power to the receiver module. The circuit could fail when the clips are broken or corroded. Replace the battery by purchasing a new one with the same type as well as voltage and size to fix the issue. If the key fob was exposed to water it is recommended to clean it using isopropyl alcohol and a paper towel. This will stop further corrosion and damage. It is also important to allow the electronics to fully dry before replacing the battery. Contacts for the battery that are defective The key fob on your Leon is equipped with metal clips that bind the battery and complete the circuit. If these clips aren't properly tensioned they could cause problems with contact. This can happen even if the battery has been replaced with one that's the wrong size or voltage. The best way to remedy this is to replace the old battery with a fresh one. Make sure to use a battery that's the same size and voltage as the original. The fob can be inoperable if contacts to the battery are defective, there is water damage, there is signal interference or a 12 voltage dead battery. In this scenario you'll need to shut off the battery that is 12 volts for a few minutes. After doing so, 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 experienced auto locksmith. UK Auto Locksmith offers a range of services for car keys including programming key chips. They provide competitive rates and are highly qualified to deal with the needs of repairing your car keys. Faulty receiver module The key fob of the seat leon is a small device that transmits signals to the vehicle. If these signals are not properly received, the vehicle's immobilizer system could stop working. This could be due to interference from objects, poor weather conditions, or transmitters that operate on the same frequency band. Key fobs can function, but only within an extremely short distance. Metal clips keep the battery in in the key fob. If they become corroded, or worn out, the contact points can fail. You can replace the battery on your key fob quickly however, you must make sure that it's of the same size and voltage as the original. If your key fob will not allow you to start your car, you may need to replace the receiver module, or the battery. This issue can be solved by a professional for the lowest cost. You can also reprogram the key fob yourself which will save you money instead of having to pay a dealer to do it. Professionals can also assist with other issues like the malfunctioning TIPM (transmission-immobilizer control unit). They can also install a brand new ignition switch or sensor. Radio interference The key fob communicates with your car using radio waves, however these signals can be mangled by a lot of interference. This can be caused by broadcast towers or satellites. This type of interference can also affect the range of your remote key can reach. If your remote key is working from a limited distance, try placing it on your head or chin to see if it solves the issue. Resetting the receiver module will usually be enough to fix the problem of a Leon keyfob that isn't working. This can be done by taking the battery off for a couple of minutes (first then, the negative cable, then the positive cable). Afterwards the key fob will function as usual. If it does not work, you will need to see a dealer authorized to reprogramme your. You may also use an OBDDII scanner in order to determine the issue. It could be that the electronic chip inside the key fob has developed a fault that will require replacement. This is more likely to happen in the event that the keyfob was exposed salt or water.