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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped working suddenly, there are a number of possible causes. They could be caused by the battery of your coin is dead, water damage, receiver module problems and radio interference. Before replacing a lost or damaged key ensure that you replace it with the correct size and type. Also, make sure that the new key is programmed to your vehicle. Dead coin battery A dead coin battery is the most common cause of your seat leon's key fob not working. It's a simple fix that will take only some minutes. The issue could result from worn out buttons or water damage, or interference in the signal, as well as receiver module issues. The problem can be solved by a scan of the OBDII or by reprogramming your key fob. The coin battery in the key fob is a vital component of the remote keyless ignition system that is found in your Seat Leon. It is held in place by metal clips. These clips complete the circuit and provide energy to the receiver module. The circuit can fail if the clips are loose or have corrosion has occurred. To fix the issue replace the battery one that is the same size, voltage and type. If the key fob was exposed to water, it is recommended to wipe it clean using a paper towel and isopropyl alcohol. This will help prevent further corrosion and damage. It is important to let the electronics completely dry before replacing the battery. Faulty battery contacts The key fob of your Leon has metal retaining clips that keep the battery in place and complete the circuit. If these clips aren't properly tensioned it could result in problems with contact. This is also a common problem 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 brand new one. Make sure you choose a battery of the same voltage and size as the original. The device may stop working due to faulty contacts on the battery or damaged or leaking water, signal interference or an unresponsive 12 volt battery. In this situation you'll have to disconnect the 12 volt battery for a short period of time. Reconnect the negative and positive cables following that. If your Seat Leon keys don't work and you are unable to use them, it's best to contact a professional auto locksmith. UK Auto Locksmith offers a variety of car key services including changing the chip on your key. They offer competitive prices and are highly qualified to solve the needs of repairing your car keys. Faulty receiver module The key fob on the seat leon is a tiny device that sends signals to the vehicle. The immobilizer of the vehicle may not function in the event that these signals are not received in a timely manner. This can be caused by interference from objects, bad weather conditions, or transmitters that utilize the same frequency band. The key fob could function but only within the limits of a small range. The battery in the key fob is held in place by retaining clips made of steel. Contact points can fail if they're worn out, corroded or worn out or rusted. You can replace the battery in your key fob with ease however you must ensure that it's the same size and voltage as the original. If your key fob is not functioning properly it could be time to replace the battery or receiver module. This issue can be addressed by a professional at a low price. You can also program the key fob by yourself which will save you money instead of having to pay the dealership to repair it. Professionals can also help you with other issues such as a malfunctioning TIPM (transmission-immobilizer control unit). They can also repair the ignition switch or sensor. Radio interference The key fob uses radio waves to communicate with the car, however the signals can be mangled when there is a significant amount of interference around. This could be due to satellites or broadcast towers. This type of interference can also alter the range of your remote. If your remote key is only working from a narrow range Try placing it close to your head or chin and see if this fixes the issue. In the majority of cases, a Leon key fob that stops functioning can be fixed by resetting the receiver module. This can be accomplished by taking out the battery that is 12 volts for a couple of minutes (first the negative cable and then the positive). The key fob will then operate normal. If this does not work, you'll need to visit a dealer authorized for reprogramming. You can also employ an OBDDII scanner for diagnosing the issue. thekeylab.co.uk could be that the chip inside the key fob has developed a fault, that will require replacement. This is more likely to happen when the keyfob is exposed to water or salt.