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Why Your Seat Leon Replacement Key Won't Work? If you're Seat Leon remote key stopped working suddenly, there are various possible causes. One of them is dead batteries water damage to the receiver module, radio interference and damaged coin batteries. Make sure to replace a lost key with the correct size and type. Also, ensure that the new key is programmed for your vehicle. Dead coin battery The most frequent reason for your seatleon key fob not working is a dead coin battery. It is simple to repair and will only take about a minute. However, the issue could also be caused by damaged buttons, water damage, signal interference, and receiver module issues. These issues can be resolved with an OBDII scanner or reprogramming of the key fob. The battery inside the key fob of your Seat Leon is a very vital component of the remote keyless system. It is fixed by metal clips. These clips complete the circuit and transmit power to the receiver module. The circuit can fail in the event that the clips are damaged, loose, or corrosion has occurred. To fix the problem replace the battery with one of 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 prevent further corrosion and damage. You should also allow the electronics to completely dry before replacing the battery. Faulty battery contacts The key fob of your Leon has metal clips that hold the battery and complete the circuit. Contact issues can arise if these clips are not properly tensioned. This is also common if the battery has been replaced with a battery that's the wrong size or voltage. The best solution for fixing this issue is to replace the old battery with a fresh one. Make sure you use a battery of the same voltage and size as the original. The fob could also fail due to damaged contacts on the battery damaged or leaking water, signal interference or a dead 12 volt battery. In this case, disconnect the 12 Volt batteries for a few minutes. 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 call an auto locksmith professional. UK Auto Locksmith can help you with a variety of car key services that include reprogramming the key chip. They have competitive rates and are highly equipped to handle your car keys repair needs. A malfunctioning receiver module The key fob of the seat Leon is a small device which transmits signals to your vehicle. If G28 Car Keys are not properly received, the vehicle's immobilizer may not function properly. This can be caused by interference from objects, poor weather conditions, or transmitters that are on the same frequency band. Key fobs can work but only within the limits of a small range. The battery inside the key fob is secured by metal retaining clips. If they are corroded or worn out the contact points might fail. You can replace the battery on your key fob quickly but you must be sure that it's of the same size and voltage as the original. If your key fob's remote does not start your car, you may need to replace the receiver module, or the battery. A professional can fix this issue at a minimal cost. They can also reprogram your key fob which will save you money by not the expense of hiring a dealer to do it for you. A professional can also assist you with other issues, for instance an inoperable TIPM (transmission immobilizer control unit). They can also fix the ignition switch or sensor. Radio interference The key fob communicates with your car using radio waves, however they are susceptible to being snuffed out by a lot of interference. This could be due to broadcast towers or satellites. This type of interference could also impact the range of your remote. If your remote only operates from a small range Try placing it close to your head or chin and test to see if it fixes the issue. In the majority of cases the Leon key fob that stops functioning can be easily repaired by resetting the receiver module. This can be accomplished by taking out the battery of 12 volts for a short period of time (first the negative cable and then the positive). After that the key fob should be functioning as normal. If this doesn't work, you will need to see a dealer authorized to reprogramme your. Alternately, you could make use of an OBDII scanner in order to pinpoint the source of the issue. It is possible that the electronic chips in the key fob have developed a fault and will require replacement. This is more likely to happen when the keyfob is exposed to salt or water.