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Why Your Seat Leon Replacement Key Won't Work? Seat Leon remote keys that suddenly stop working could be caused by a myriad of causes. Some of them include: a dead battery or water damage to receiver module, radio interference and a damaged coin battery. Make sure you replace a lost key using the correct type and size. Also, make sure that the new key has been programmed for your vehicle. Dead coin battery A dead coin battery is the most frequent cause of your seat leon's key fob not functioning. It is simple to fix and should take only about a minute. However, the issue could be caused by damaged buttons, worn buttons or signal interference, as well as receiver module problems. These issues can be fixed with an OBDII scan tool or by reprogramming the key fob. The battery inside the key fob of your Seat Leon is a very important component of your remote keyless system. It is held in place by metal clips. These clips complete the circuit, and supply power to the receiver module. The circuit can fail if the clips are broken or corrosion has occurred. Replace the battery with one that is the same model in size, voltage, and type to correct the issue. If the key fob has been exposed to water it is recommended that you clean it using isopropyl alcohol and a paper towel. This will help prevent further corrosion and damage. It is crucial to let the electronics completely dry before replacing the battery. Contacts of the battery may be damaged. The key fob of your Leon comes with metal clips that secure the battery and complete the circuit. Contact issues can happen if the clips aren't properly tensioned. This is also a common problem if the battery has been replaced with one that's the wrong size or voltage. The best solution for fixing this issue is to replace the old battery with a new one. Be sure to use the same size and voltage as the original. The fob can also be inoperable due to malfunctioning battery contacts or signal interference, water damage, or a dead 12 volt battery. In this situation, disconnect the 12 Volt batteries for a few moments. Reconnect the positive and negative cables following that. If your Seat Leon keys aren't working it could be an appropriate time to seek out a specialist auto locksmith. UK Auto Locksmith offers a range of car key services including programming key chips. They provide competitive rates and are highly trained to take care of the repair of your car keys. Faulty receiver module The seat leon key fob is a tiny device that sends signals to your vehicle. The immobilizer system in the car may stop working if these signals are not received correctly. This could be due to interference from objects, poor weather conditions, or transmitters that are on the same frequency band. The key fob could work within a limited range. Metal clips hold the battery in place inside the key fob. Contact points may fail if they are corroded, worn out or rusted. You can replace the battery on your key fob with ease however you must ensure that it's of the same size and voltage as the original. If your key fob can not start your vehicle, you may have to replace the receiver module or battery. This issue can be solved by a professional for an affordable cost. They can also reprogram your key fob which will save you money by not having to pay a dealership to do it for you. 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 uses radio waves to communicate with the car, however the signals can be mangled when there is a huge amount of interference in the vicinity. This can be caused by broadcast towers or satellites. This type of interference can also impact the range of your remote. If your remote key only works from a short distance, try placing it near your head or chin and see if this fixes the problem. Resetting seat spare key will usually be enough to repair a Leon keyfob that isn't functioning. This can be done by taking out the 12 volt battery for a couple of minutes (first the negative cable first, then the positive). The key fob should then function normally. If not, you'll need to visit an authorized dealer for reprogramming. Alternatively, you can also use an OBDII scanner to identify the root of the problem. It is possible that the electronic chips in the key fob have developed a fault and will require replacement. This is more likely in the event that the keyfob was exposed salt or water.