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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped working suddenly, there are several possible causes. This could be due to a dead coin battery water damage, receiver module problems and radio interference. When replacing a lost key, make sure you replace it with the correct size and type. Also, ensure that the new key is programmed to your vehicle. Dead coin battery A dead coin battery is the most common cause of your seat's key fob not working. This is easy to fix and should take only some minutes. However, the issue could also be caused by damaged buttons, water damage or signal interference receiver module issues. These issues can be resolved by using an OBDII scanner, or reprogramming your key fob. The coin battery inside the key fob of your Seat Leon is a very crucial component of the remote keyless system. It is held in place by metal clips. These clips complete the circuit and transmit energy to the receiver module. The circuit may fail when the clips become loose or have damaged or corroded. To fix the issue replace the battery with one of the same size, voltage and type. If the key fob was exposed to water, it is suggested to clean it using a paper towel and isopropyl alcohol. This will prevent further corrosion and damage. It is essential to let the electronics dry completely before you replace the battery. Contacts to the battery are not working properly. The key fob of your Leon has metal clips that secure the battery and complete the circuit. If they're not properly tightened it could result in contact issues. This can also happen when the battery has been replaced with one that's the wrong size or voltage. This can be fixed by replacing the old battery with a new one. Choose a new battery that is the same size and voltage as the original. The fob might also stop working if the battery contacts are faulty or if there is water damage, there is signal interference or a 12- volt dead battery. In this scenario, you must disconnect the 12 Volt batteries for a few minutes. Reconnect the positive and negative cables following that. If your Seat Leon keys don't work then you might need to contact a professional auto locksmith. UK Auto Locksmith can help you with a range of car key services such as reprogramming your key chip. They offer affordable rates and are well trained to handle car keys repair requirements. The receiver module is not working properly. The key fob of the seat Leon is a small piece of equipment that transmits signals to your vehicle. If these signals are not properly received, the vehicle's immobilizer system could stop working. This can be due to interference from objects, poor weather conditions, or transmitters that operate on the same frequency band. The key fob could operate within a specific range. Metal clips keep the battery in place within the key fob. If they are corroded or worn out, the contact points can fail. It is easy to replace the battery in your key fob, but make sure it's the exact size and voltage. If your key fob will not allow you to start your vehicle, you may have to replace the receiver module, or the battery. A professional can repair this issue for a small cost. You can also change the code of the key fob on your own which will save you money instead of having to pay the dealership to do it. A professional can also assist you with other issues, such as the malfunctioning TIPM (transmission immobilizer control unit). They can also install a new ignition switch or sensor. Radio interference The key fob utilizes radio waves to communicate with the car, however these signals may be mangled in the event of a large amount of interference around. This could be caused by broadcast towers or satellites. This type of interference may also impact the range of your remote. If your remote is operating from a small distance put it near your chin or head to see if it solves the problem. In the majority of instances an Leon key fob that has stopped functioning can be fixed by resetting the receiver module. seat ibiza key fob can be done by removing the battery of 12 volts for a couple of minutes (first the negative cable, then the positive cable). The key fob should then work normal. If not, you'll require a visit to an authorized dealer to reprogramme the. Additionally, you can use an OBDII scanner to pinpoint the source of the problem. It's possible that the electronic chips inside the key fob have developed an issue and need to be replaced. This is more likely when the keyfob is exposed to water or salt.