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Why Your Seat Leon Replacement Key Won't Work? If you're Seat Leon remote key stopped suddenly, there could be a number of possible causes. Some of them include: dead batteries or water damage to the receiver module, radio interference, and an unrepaired coin battery. Make sure you replace a lost or damaged key with the correct size and type. Also, make sure that the new key has been programmed for your vehicle. Dead coin battery The most common reason for your seatleon key fob not working is a dead coin battery. It is a simple fix that takes only about a minute. However, the issue could be caused by worn buttons, water damage or signal interference receiver module problems. These issues can be resolved through an OBDII scan, or by reprogramming the key fob. The coin battery in the key fob of your Seat Leon is a very crucial component of the remote keyless system. It is held in place by steel clips. These clips complete the circuit, and supply power to receiver module. The circuit may fail if the clips are loose or have damaged by corrosion. Replace the battery with a brand new one of the same type as well as voltage and size to fix the problem. If the key fob has been exposed to water, it is recommended to clean it using a paper towel and isopropyl alcohol. This will help to prevent further corrosion or damage. It is also recommended to allow the electronics to completely dry before replacing the battery. Contacts of the battery may be damaged. The key fob on your Leon is equipped with metal clips that hold the battery and complete the circuit. If they're not properly tensioned this can lead to contact issues. This could also happen when you replace the battery with one of the wrong voltages or sizes. The best solution to remedy this is to replace the old battery with a new one. Be sure to use a battery of the same size and voltage as the original. The fob could also stop working if contacts on the battery are damaged or there's water damage, signal interference, or a 12 Volt dead battery. In this case you'll need to shut off the battery that is 12 volts for a couple of minutes. After that, you can reconnect the negative and positive cables. If your Seat Leon keys don't work, you may need to call an auto locksmith professional. UK Auto Locksmith offers a variety of car key services including changing the chip on your key. They have low prices and are skilled to handle your car keys repair needs. A malfunctioning receiver module The key fob of a seat leon is a small device that transmits signals to the vehicle. The immobilizer of the vehicle may not function when these signals aren't received in a timely manner. This can be due to interference from objects, bad weather conditions, or transmitters operating on the same frequency band. Key fobs can function but only within an extremely short distance. The battery inside the key fob is secured by metal retaining clips. If they become corroded, or worn out the contact points could fail. You can replace the battery in your key fob with ease but you must be sure that it's the exact size and voltage as the original. If your key fob won't starting the car, it may be time to replace the battery or the receiver module. A professional can fix this issue for a small cost. They can also reprogram your key fob, which will save you money from having to pay a dealership to perform the task for you. A professional can also help you with other issues, like a faulty TIPM (transmission immobilizer control unit). They can also install a brand new ignition switch or sensor. g28carkeys.co.uk with the car by radio waves, however they can be squelched by a lot of interference. This can be due to broadcast towers, airplanes, and even satellites. This type of interference may also impact the range of your remote. If your remote key is working from a short distance Try placing it on your chin or head to see if it solves the problem. In the majority of cases an Leon key fob that has stopped functioning can be easily repaired by resetting the receiver module. This can be accomplished by removing the battery that is 12 volts for a short period of time (first the negative cable followed by the positive cable). The key fob should operate normal. If it doesn't work, you'll need to see a dealer authorized to reprogramme the. Additionally, you can use an OBDII scanner to pinpoint the source of the problem. It is possible that the electronic chips in the key fob have developed a fault and will need to be replaced. This is more likely when the key fob is been exposed to salt or water the water.