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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 variety. Some of these include: dead batteries or water damage to the receiver module, radio interference and the battery of your coin is damaged. Make sure to replace a lost key using the correct type and size. Also, make sure that the new key is programmed to your vehicle. Dead coin battery The most common reason for your seatleon key fob not working is a dead coin battery. This is an easy repair and will only take less than a few minutes. The issue could also be caused by worn-out buttons and water damage or interference in the signal, as well as receiver module issues. These issues can be resolved by using an OBDII scanner, or reprogramming your key fob. The coin battery in the key fob is an essential component of the remote keyless ignition system of your Seat Leon. It is fixed by metal clips. These clips complete the circuit and transmit power to the receiver module. The circuit can fail when the clips become 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 wipe it clean using a paper towel and isopropyl alcohol. This will help avoid further damage or corrosion. It is essential to let the electronics completely dry before replacing the battery. Faulty battery contacts The key fob of your Leon has metal retaining clips that hold the battery in place and complete the circuit. If they're not properly tensioned they could cause problems with contact. This could also occur when you replace the battery with the wrong voltage or dimensions. Suggested Browsing to fix this is to replace the old battery by a new one. Choose a battery of exactly the same size and voltage as the original. The fob may also cease to function due to defective contacts on the battery signal interference, water damage or a dead 12 volt battery. In this instance you'll need to shut off the 12 volt battery for a couple of minutes. Reconnect the negative and positive cables afterward. If your Seat Leon keys aren't working then it's an appropriate time to seek out a specialist auto locksmith. UK Auto Locksmith offers a range of car key services including the reprogramming of key chips. They offer low prices and are skilled to handle your car keys repair requirements. Receiver module that is defective The key fob on the seat leon is a small device that transmits signals to the vehicle. If the signals aren't properly received, the vehicle's immobilizer may not function properly. This could be due to interference from objects, bad weather conditions, or transmitters on the same frequency band. The key fob may function but only in the range of a few meters. Metal clips hold the battery in within the key fob. If they are corroded or worn out the contact points could fail. You can easily replace the battery on your key fob, but make sure it's of the same size and voltage. If your key fob's remote does not allow you to start your vehicle, you may have to replace the receiver module or the battery. A professional can fix this issue for a small cost. They can also reprogram your key fob, which will save you money from the expense of hiring a dealer to help you. Professionals can also assist you in other problems, such as a malfunctioning TIPM (transmission-immobilizer control unit). They can also replace 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 can occur from broadcast towers, airplanes and even satellites. This type of interference could also affect the range of your key. If your remote key is only working from a narrow range, try placing it near your chin or head and test to see if it fixes the issue. Resetting the receiver module can be enough to fix the issue. Leon keyfob that stopped functioning. You can do this by removing the battery for a couple of minutes (first, the negative cable, and then the positive). Then the key fob will perform as expected. If not, you'll need to visit an authorized dealer for reprogramming. You can also employ an OBDDII scanner to identify the issue. It could be that the electronic chip within the key fob has developed a fault, that will require replacement. This is more likely when the keyfob is exposed to water or salt.