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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped suddenly, there could be a number of possible causes. Some of them include: dead batteries, water damage to the receiver module, radio interference, and a damaged coin battery. Make sure to replace a lost or damaged key with the correct size and type. Also, make sure that the new key is programmed to your vehicle. Dead coin battery A dead battery for your coin is the most frequent cause of your seat leon's key fob not working. This is a simple fix and can be done in just about a minute. However, the issue could also be caused by damaged buttons, water damage or signal interference receiver module issues. These issues can be resolved with an OBDII scan or by reprogramming your key fob. The battery inside the key fob is an important component of the remote keyless ignition system of your Seat Leon. It is fixed by metal clips. These clips complete the circuit and send power to receiver module. The circuit may fail if the clips are loose or damaged by corrosion. Replace the battery with one with the same type in size, voltage, and type to correct the problem. If the key fob was exposed it is recommended that you clean it using isopropyl alcohol and paper towel. This will prevent further corrosion and damage. Also, you should allow the electronics to fully dry before replacing the battery. Contacts to the battery are not working properly. The key fob on your Leon is equipped with metal clips to secure the battery and complete the circuit. Contact issues can occur if the clips aren't properly tensioned. This could also happen if you replace the battery with the wrong voltages or sizes. This can be fixed by replacing the old battery with a brand new one. Make sure to use a battery that's similar in size and power as the original. The fob can also stop working if battery contacts are faulty or there is water damage, there is signal interference, or a 12 Volt dead battery. In this instance you'll need to shut off the 12 volt battery for a short period of time. After doing so, reconnect the positive and negative cables. If your Seat Leon keys aren't working It could be the right the time to speak with a specialist auto locksmith. UK Auto Locksmith can help you with a variety of car key services that include reprogramming the key chip. They have competitive rates and are highly equipped to handle your car keys repair requirements. Receiver module that is defective The seat leon key fob is a small device that transmits signals to your vehicle. The immobilizer system of the car may stop working if these signals are not received in a timely manner. This can be caused by interference from objects, bad conditions in the weather, or transmitters that use the same frequency band. The key fob could operate within a specific range. The battery in the key fob is secured by retaining clips made of steel. Contact points may fail if these are damaged, worn-out or damaged by rust. seat leon replacement key can replace the battery in your key fob in a snap however you must ensure that it is the same size and voltage as the original. If your key fob won't working to start the car, it may be time to replace the battery or receiver module. A professional can repair this problem for a low cost. You can also change the code of the key fob on your own, saving money on having to pay a dealership to complete the process. Professionals can also help you 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 utilizes radio waves to communicate with the car, however these signals could be squelched when there is a huge quantity of interference within. This can be due to broadcast towers, airplanes, and even satellites. This kind of interference can affect the range of your remote key can reach. If your remote key is only working from a narrow distance try placing it near your head or chin and check if this solves the issue. In the majority of instances an Leon key fob that has stopped functioning can be easily repaired by resetting the receiver module. This can be done by taking out the battery that is 12 volts for a short period of time (first the negative cable first, then the positive cable). The key fob should then operate normal. If it doesn't work, you will be required to visit a dealership authorized for reprogramming. You can also employ an OBDDII scanner in order to determine the issue. It's possible that the electronic chips in the key fob have developed faults and need to be replaced. This is more likely to happen when the key fob has been exposed to water or salt.