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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped working suddenly, there are many possible reasons. There are a variety of reasons to blame. a dead battery water damage to the receiver module, radio interference, and an unrepaired coin battery. Make sure you replace a lost key with the correct size and type. Also, make sure that the new key is programmed for your vehicle. Dead coin battery The most common reason behind your seat leon key fob not working is a dead coin battery. This is an easy fix and should only take about a minute. The issue could be caused by worn buttons, water damage or interference in the signal as well as receiver module issues. These issues can be solved through an OBDII scan, or by reprogramming the key fob. The coin battery that is inside the key fob is a crucial component of the remote keyless ignition system in your Seat Leon. It is equipped with metal clips which keep it in place and also complete the circuit to send power to the receiver module. If the clips are damaged or corroded, it can cause the circuit to fail. To fix the issue, replace the battery with one that is the same size, voltage and type. If the key fob has been exposed to water, it is recommended to clean it with paper towel and isopropyl alcohol. This will help avoid further damage or corrosion. It is crucial to let the electronics dry completely before you replace the battery. Faulty battery contacts The key fob on your Leon has metal clips that secure the battery and complete the circuit. If these aren't properly tensioned, it can cause contact issues. This can happen even when the battery has been replaced with one that's wrong size or voltage. This can be corrected by replacing the old battery with a new one. Make sure you use a battery of the same size and voltage as the original. The fob may also stop working due to faulty battery contacts water damage, signal interference, or a dead 12 volt battery. In this case, disconnect the 12 volt batteries for a few moments. Reconnect the positive and negative cables following. If you're Seat Leon keys aren't working, it may be an appropriate time to seek out a specialist auto locksmith. UK Auto Locksmith offers a variety of services for car keys including reprogramming key chips. They offer competitive rates and are highly skilled to handle your car keys repair requirements. A malfunctioning receiver module The key fob on a seat leon is a small device that sends signals to the vehicle. If the signals aren't properly received, the vehicle's immobilizer system may stop working. This can be due to interference from objects, bad weather conditions, or transmitters using the same frequency band. www.g28carkeys.co.uk can function, but only within the range of a few meters. Metal clips keep the battery in in the key fob. Contact points may fail if these are damaged, worn-out or corrosion-prone. You can easily replace the battery on your key fob, but be sure it's the same size and voltage. If your key fob isn't functioning properly, it may be time to replace the battery or the receiver module. The issue can be resolved by a professional for an affordable cost. They can also reprogram your key fob, which will save you money by not needing to pay a dealer to complete the process for you. Professionals can also help you with other issues like the malfunctioning TIPM (transmission-immobilizer control unit). They can also install a new ignition switch or sensor. Radio interference The key fob communicates with the car by radio waves, but these signals can be mangled due to a large amount of interference. This could be caused by broadcast towers or satellites. This kind of interference can affect the range of your remote key can reach. If your remote key is working from a short distance you can try placing it on your chin or head to see if this fixes the issue. In the majority of cases, a Leon key fob that has stopped functioning can be fixed by resetting the receiver module. This can be accomplished by taking out the 12 volt battery for a few minutes (first the negative cable first, then the positive cable). Then the key fob should perform as expected. If it doesn't work, you will need to visit a dealer licensed to reprogramme. You may also use an OBDDII scanner to identify the problem. It could be that the chip inside the key fob has developed a fault, that will require replacement. This is more likely when the key fob is been exposed to salt or the water.