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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 variety of causes. There are a variety of reasons to blame. dead batteries or water damage to the receiver module, radio interference, and an unrepaired coin battery. Make seat car key cover to replace a lost key using the correct type and size. Also, ensure that the new key is programmed to your vehicle. Dead coin battery The most common reason for your seatleon key fob not working is a dead coin battery. This is an easy fix and should only take less than a few minutes. The issue may also be caused by worn-out buttons or water damage, or interference in the signal, as well as receiver module issues. These issues can be resolved with an OBDII scan tool or reprogramming the key fob. The coin battery in the key fob of your Seat Leon is a very important component of your remote keyless system. It is made of metal and has clips that keep it in position and complete the circuit to supply power to the receiver module. If the clips are damaged or corroded, they could cause the circuit fail. To fix the problem, 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 with paper towel and isopropyl alcohol. This will help prevent further damage or corrosion. You should also allow the electronics to dry completely before replacing the battery. Contacts for the battery that are defective The key fob on your Leon is equipped with metal clips to secure the battery and complete the circuit. Contact issues can arise if these clips are not properly tensioned. This can happen even when the battery was replaced with a battery that's the wrong size or voltage. This can be corrected by replacing the old battery with a new one. Be sure to use a battery of the same size and voltage as the original. The device may stop working due to faulty contacts on the battery signals interference, water damage, or a dead 12 volt battery. In this situation, you'll need to disconnect the 12 volt battery for a couple of minutes. After that, connect the negative and positive cables. If your Seat Leon keys aren't working it could be the right time to call a professional auto locksmith. UK Auto Locksmith can help you with a range of car key services including reprogramming of the key chip. They provide competitive rates and are well-trained to handle the repairs to your car key. The receiver module is not working properly. The key fob on the seat leon is a small device that sends signals to the vehicle. The immobilizer system of the car may not function in the event that these signals are not received in a timely manner. This can be due to interference from objects, bad weather conditions, or transmitters that operate on the same frequency band. The key fob could work but only within an extremely short distance. Metal clips keep the battery in place within the key fob. If they are corroded or worn out the contact points may fail. You can easily replace the battery in your key fob, but be sure that it's the same size and voltage. If your key fob will not allow you to start your car, you may need to replace the receiver module or the battery. A professional can repair this issue for a small cost. They can also reprogram your key fob which will save you money by not needing to pay a dealer to do it for you. Professionals can also assist you with other issues, such as an issue with your TIPM (transmission-immobilizer control unit). They can also repair the ignition switch or sensor. Radio interference The key fob communicates with the car by radio waves, but they are susceptible to being snuffed out due to a large amount of interference. This could be caused by broadcast towers, airplanes, and even satellites. This kind of interference could also alter the range of your remote. If your remote key is operating from a small distance Try placing it next to your chin or head to see if it fixes the problem. In the majority of cases, a Leon key fob that has stopped functioning can be easily fixed by resetting the receiver module. You can do this by disconnecting the battery for a few minutes (first first, the negative cable, and then the positive). Afterwards, the key fob should perform as expected. If it does not work, you'll need to see a dealer authorized to reprogramme the. You can also use an OBDDII scanner to diagnose the problem. It could be that the electronic chip within the key fob has developed a fault which will require replacement. This is especially true when the key fob is been exposed to salt or waters.