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Why Your Seat Leon Replacement Key Won't Work? seat car key replacement that suddenly stop working could be caused by a myriad of causes. These include the battery of your coin is dead, water damage, receiver module problems and radio interference. If you are replacing a key that has been lost, make sure the replacement key is of the correct size and type. Also, make sure that the new key is programmed for your vehicle. Dead coin battery A dead battery for your coin is the most frequent reason for your seat's key fob not functioning. This is an easy repair and will only take a few minutes. However, the problem may be caused by damaged buttons, worn buttons and signal interference as well as receiver module problems. These issues can be addressed by using an OBDII scanner or reprogramming of the key fob. The coin battery inside the key fob of your Seat Leon is a very vital component of the remote keyless system. It has metal retaining clips to keep it in place and help complete the circuit that supplies power to the receiver module. The circuit can fail if the clips are loose or corrosion has occurred. To fix the problem replace the battery one of the same size, voltage, and type. If the key fob has been exposed to water, it is recommended to clean it with a paper towel and isopropyl alcohol. This will stop further corrosion and damage. It is crucial to let the electronics completely dry before replacing the battery. Contacts for the battery that are defective The key fob of your Leon includes metal retaining clips that keep the battery in place and complete the circuit. Contact issues can arise if the clips aren't properly tensioned. This can also happen when you replace the battery with one of the wrong sizes or voltages. This can be corrected by replacing the old battery with a brand new one. Use a battery that is identical in size and voltage as the original. The fob may be unable to function if the contacts of the battery are not working properly, there is water damage, there is signal interference or a 12- volt dead battery. In this situation, disconnect the 12 Volt batteries for a few moments. After that, connect the negative and positive cables. If your Seat Leon keys don't work it is possible to call an experienced auto locksmith. UK Auto Locksmith offers a variety of car key services including the reprogramming of key chips. They provide competitive rates and are highly qualified to solve your car key repair needs. The receiver module is not working properly. The key fob on a seat leon is a tiny device that transmits signals to the vehicle. The immobilizer of the vehicle may not function if these signals are not received in a timely manner. This could be due to interference from objects, poor conditions in the weather, or transmitters that use the same frequency band. Key fobs can work but only in the limits of a small range. The battery in the key fob is secured by metal retaining clips. If they are corroded or worn out the contact points could fail. You can easily replace the battery on your key fob, but be sure it's of the same size and voltage. If your key fob has stopped functioning properly and it is not working, it could be time to replace the battery or receiver module. This issue can be addressed 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 the dealership to complete the process. A professional can also help you with other issues, for instance the malfunctioning TIPM (transmission immobilizer control unit). They can also fix the ignition switch or sensor. Radio interference The key fob uses radio waves to communicate with the car, but these signals could be squelched when there is a huge amount of interference around. This could be caused by satellites or broadcast towers. This kind of interference could also impact the range of your remote. If your remote operates only from a limited distance Try placing it close to your chin or forehead and check if this solves the problem. Resetting the receiver module will usually be enough to fix the problem of a Leon keyfob that has stopped functioning. This can be done by removing the battery with 12 volts for a few minutes (first the negative cable followed by the positive cable). Then the key fob will work as normal. If not, you may be required to visit an authorized dealer for reprogramming. Alternatively, you can also use an OBDII scanner to identify the root of the issue. It is possible that the electronic chips inside the key fob have developed an issue and require replacement. This is especially true if the key fob has been exposed to salt or seawater.