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Why Your Seat Leon Replacement Key Won't Work? Seat Leon remote keys that suddenly stop working can be caused by a myriad of causes. These include: a dead coin battery, water damage, receiver module issues and radio interference. Make sure you replace a lost key using the correct type and size. Also, ensure that the new key is programmed to your vehicle. Dead coin battery A dead coin battery is the most common reason for your seat's key fob not working. It is a simple fix that should only take about a minute. 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 addressed by using an OBDII scanner, or reprogramming your key fob. The coin battery inside the key fob is an important element of the remote keyless ignition system in your Seat Leon. It is made of metal and has clips that keep it in position and complete the circuit by sending power to the receiver module. If the clips become loose or have corrosion, it can cause the circuit to fail. To fix the problem replace the battery one that is the same size, voltage and type. If the key fob was exposed to water, it is recommended that you clean it using isopropyl alcohol and paper towel. This will help prevent further corrosion and damage. It is essential to let the electronics completely dry before replacing the battery. Contacts for the battery that are defective The key fob on your Leon has metal clips that hold the battery and complete the circuit. If they're not properly tensioned they could cause contact issues. This could also occur when you replace the battery with one of the wrong voltage or size. This can be fixed by replacing the old battery with a new one. Make sure to use a battery that's exactly the same size and voltage as the original. The fob can also cease to function due to defective contacts on the battery, damaged or leaking water, signal interference, or a dead 12 volt battery. In this instance, disconnect the 12 Volt batteries for a few minutes. Reconnect the positive and negative cables following. If your Seat Leon keys aren't working, it may be the right time to call a professional auto locksmith. UK Auto Locksmith offers a variety of car key services including programming key chips. They have low prices and are trained to handle your car keys repair requirements. Faulty receiver module The key fob of the seat leon is a small device that sends signals to the vehicle. The immobilizer system of the car can stop working if these signals are not received correctly. This could be because of interference from objects, poor weather conditions, or transmitters that operate on the same frequency band. The key fob might function within a certain range. Metal clips hold the battery in place within the key fob. If they are corroded or worn out the contact points may fail. You can replace the battery on your key fob easily however, you must make sure that it's of the same size and voltage as the original. If your key fob is not functioning properly and it is not working, it could be time to replace the battery or the 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 paying the dealer to perform the task. Professionals can also help you with other issues like malfunctioning TIPM (transmission-immobilizer control unit). They can also install a brand new ignition switch or sensor. seat key utilizes radio waves to communicate with the car, but these signals can be scrambled in the event of a large amount of interference around. This could be caused by satellites or broadcast towers. This kind of interference could also affect the range your key. If your remote is working from a limited distance put it on your head or chin to see if that fixes the problem. Resetting the receiver module is typically enough to fix the problem of a Leon keyfob that has stopped functioning. This can be done by removing the battery with 12 volts for a few minutes (first the negative cable followed by the positive cable). Then the key fob will be functioning as normal. If it doesn't work, you will be required to visit a dealership authorized to reprogramme your. Alternatively, you can also make use of an OBDII scanner in order to pinpoint the source of the issue. It is possible that the electronic chips inside the key fob have developed a fault and will need to be replaced. This is more likely to happen if the keyfob has been exposed to salt or water.