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Why Your Seat Leon Replacement Key Won't Work? Seat Leon remote keys that suddenly stop working may be caused by a myriad of causes. These include a dead coin battery, water damage, receiver module issues and radio interference. Before replacing a lost key ensure that you replace it with the correct size and type. Also, make sure that the new key is programmed to your vehicle. Dead coin battery A dead coin battery is the most frequent reason for your seat leon's key fob not functioning. It is simple to fix and should take only about a minute. The issue could be caused by worn out buttons as well as water damage or interference in the signal as well as 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 supply power to the receiver module. If the clips become loose or corroded, it can cause the circuit to fail. To fix the issue change the battery to one of the same size, voltage, and type. If the key fob was exposed to water, it is recommended to wipe it clean using a paper towel and isopropyl alcohol. This will prevent further corrosion and damage. You should also allow the electronics to dry completely before replacing the battery. Contacts for the battery that are defective The key fob of your Leon includes metal retaining clips that hold the battery in place and complete the circuit. If breaking news aren't properly tensioned, it can cause contact issues. This can also happen if you replace the battery with the wrong voltage or dimensions. This can be fixed by replacing the old battery with a brand new one. Be sure to use a battery of the same size and voltage as the original. The fob can also stop working if contacts on the battery are damaged or there is water damage, signal interference or a 12 voltage dead battery. In this instance you'll have to disconnect the 12 volt battery for a short period of time. Reconnect the positive and negative cables afterward. If your Seat Leon keys don't work and you are unable to use them, it's best to contact an experienced auto locksmith. UK Auto Locksmith offers a variety of services for car keys including reprogramming key chips. They offer competitive prices and are well-trained to deal with your car key repair needs. Faulty receiver module The key fob on the seat leon is a tiny device that transmits signals to the vehicle. The immobilizer mechanism of the car may stop working when these signals aren't received in a timely manner. This could be due interference from objects, bad weather conditions, or transmitters that operate on the same frequency band. The key fob can work within a limited range. Metal clips hold the battery in place inside the key fob. Contact points may fail if they're damaged, worn-out or corrosion-prone. It is easy to replace the battery in your key fob, but make sure that it's the same size and voltage. If your key fob won't functioning properly and it is not working, it could be time to replace the battery or receiver module. This issue can be solved by a professional at an affordable cost. You can also program the key fob by yourself, saving money on having to pay the dealer to complete the process. A professional can also assist you with other issues, like a faulty TIPM (transmission immobilizer control unit). They can also help you replace the ignition switch or sensor. Radio interference The key fob communicates with the car using radio waves, however they are susceptible to being snuffed out by a variety of interference. This could be caused by satellites or broadcast towers. This kind of interference could also affect the range of your key is able to reach. If your remote key is working from a short distance put it near your chin or head to see if it solves the issue. 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 for a few minutes (first, the negative cable, then the positive). Afterwards the key fob will work as normal. If it doesn't work, you will be required to visit a dealership authorized for reprogramming. You can also utilize an OBDDII scanner to diagnose the issue. It could be that the electronic chip in the key fob has developed a fault, that needs to be replaced. This is more likely to happen in the event that the keyfob was exposed salt or water.