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Why Your Seat Leon Replacement Key Won't Work? If you're Seat Leon remote key stopped working at a sudden point, there are many possible reasons. Some of them include: a dead battery or water damage to the receiver module, radio interference, and the battery of your coin is damaged. Make sure to replace a lost key with the correct type and size. Also, make sure that the new key is programmed to your vehicle. Dead coin battery A dead battery for your coin is the most common cause of your seat leon's key fob not functioning. This is a straightforward fix that takes only about a minute. The issue could also be caused by worn buttons and water damage or interference in the signal, and receiver module issues. These issues can be solved through an OBDII scan, or by reprogramming your key fob. The coin battery that is 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 to keep it in place and also complete the circuit to send power to the receiver module. If the clips are loosened or are corroded, it could cause the circuit fail. To fix the issue replace the battery 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 corrosion or damage. It is also important to allow the electronics to completely dry before replacing the battery. Faulty battery contacts The key fob of your Leon features metal retaining clips that keep the battery in place and complete the circuit. Contact issues can occur if these clips are not properly tensioned. This is also the case if you replace the battery with the wrong voltage or size. The best way for fixing this issue is to replace the old battery with a fresh one. Choose a battery of the same size and voltage as the original. The device may stop working due to faulty contacts on the battery, damaged or leaking water, signal interference, or the battery is dead. In this scenario, you'll need to disconnect the 12 volt battery for a few minutes. After that, connect the negative and positive cables. If your Seat Leon keys aren't working then it's an appropriate time to seek out a specialist auto locksmith. UK Auto Locksmith can help you with a variety of key replacement services for cars, including reprogramming the key chip. They offer competitive prices and are highly trained to deal with your car key repair needs. Receiver module that is defective The key fob of the seat leon is a small device that transmits signals to the vehicle. The immobilizer system of the car may stop working in the event that these signals are not received correctly. This could be due to interference from objects, bad weather conditions, or transmitters that operate on the same frequency band. The key fob may still operate in a limited range. Metal clips keep the battery in within the key fob. Contact points may fail if they are worn out, corroded or worn out or rusted. You can replace the battery on your key fob with ease, but you must ensure that it is the same size and voltage as the original. If seat key cover will not start your vehicle, you may have to replace the receiver module or battery. The issue can be resolved by a professional at very little cost. They can also reprogram your key fob which will save you money from needing to pay a dealer to help you. A professional can also help you with other issues, such as an inoperable TIPM (transmission immobilizer control unit). They can also fix the ignition switch or sensor. Radio interference The key fob utilizes radio waves to communicate with the car, however these signals may be mangled when there is a huge quantity of interference within. This could be due to satellites or broadcast towers. This type of interference can affect the range of your key. If your remote is working from a short distance, try placing it next to your chin or head to see if this fixes the issue. In most cases, a Leon key fob that has stopped functioning can be easily fixed 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, then the positive cable). The key fob will then be working normal. If this doesn't work, you will need to see a dealer authorized for reprogramming. Alternately, you could make use of an OBDII scanner in order to pinpoint the source of the issue. It could be that the chip inside the key fob has developed a fault which will require replacement. This is more likely when the key fob has been exposed to salt or water.