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Seat Leon Key Fob Replacement It may not be required to replace or reprogramme your seat leon remote fob if it has stopped working. The first thing you should be looking for is the battery. You can pry the battery out of most fobs by using a small gap or switch. Use the same type battery as the original. Dead coin battery A dead battery is one of the most common reasons for a key fob that isn't working. It's not expensive and takes only a few minutes, but the first thing you must ensure that you're using the correct type of battery. Most key fobs use CR2032 3V batteries, which are sold at most electronics stores and on the internet. You can find instructions on how to open the key fob or replace its battery in your owner's manual, YouTube video, or other online sources. Water Damage Even if your Leon key fob is water-proof, prolonged exposure to salt water may damage the internal electronic chip that controls the remote. In some instances this can also block the key fob from connecting to the vehicle. To resolve this issue you'll need to clean the chip with alcohol isopropyl or an electronic cleaner. then dry it completely before placing the battery back. If the battery isn't the problem the buttons may be misaligned as a result of the constant use. If they are loose or damaged you can easily solder them back into their original position. You can do this on your own, or take the key fob into an auto shop for repair. It may be necessary to replace the remote based on the degree of the issue. Faulty battery contacts A damaged or defective battery contact is one of the most frequent reasons for a keyfob not working. This can be caused by dirt or water in the key fob case or simply wear and tear that happens over time. The solution is to clean the battery's contacts with isopropyl alcohol. This will restore the connection between the microprocessor's battery and the battery. This will enable the key fob to communicate with the vehicle. You can replace the battery in your Leon key fob by prying open the two halves using a small flat screwdriver and then removing the old battery. You can buy a new battery at any electronics store. Follow the steps in the owner's handbook when taking the old battery out and installing the new one. You could also try resetting the remote keyless system by disconnecting the battery with 12 volts for a few minutes. seat leon key fob will reset all the on-board computers and might allow your key fob to communicate with your vehicle. If the issue persists, you should consult your dealer to reprogram your keys. They will use an OBDII scan tool to pinpoint the issue and could be in a position to reprogram your key fob without the need for another original key. This process will usually be completed in less than a hour. The dealer can also reset the immobilizer. Water damage It's important to take action immediately if the key fob has been submerged in water. Electronics and water don't mix well and could cause damage to the circuit board. A key fob that is wet is also likely to stop working this is why it's so important to deal with this problem as soon as you can. If you accidentally dropped your key fob into the water or puddle or even thrown it into the wash accidentally, the first step is to remove the battery and let it dry completely. You can also use a paper towel or tissue to dry the casing. You could also put it in a bag with silica gel packs, which will aid in removing moisture. Once your key fob's completely dry, it's the time to start putting it back together. Make sure that the battery is securely inserted and the metal contacts on the circuit board are clean. If you need to, apply a bit of isopropyl clean the contacts. It should be possible to start your vehicle using the key fob after all this. If it's still not working then you might need to resolve other issues. This could be due to a damaged key or a transponder which requires reprogramming. A malfunctioning receiver module If your key fob was not working after being dropped on the floor, or simply suddenly stopped working out of out of the blue, and you've tried everything, including replacing the battery, reprogramming and using a spare fob it could be time to replace the receiver module. This electronic component sends signals to the other modules in the car, including the immobilizer. Without a working receiver module, the security system on your car will not function, and you won't be able to start your car. If the receiver module within your seat leon is damaged or isn't sending the correct radio frequency signals, you'll see an error message on the instrument panel. Connecting an OBDII scanner to the vehicle's diagnostic port and checking for any errors can often solve the issue. Then you can try reprogramming the key using a dealer's programmer to see if this solves the issue. Key fobs are subject to a lot of abuse, so they aren't indestructible. The most common points of failure are the battery terminal contacts and buttons. They are easy to fix and replace with minimal effort. If the key fob batteries in your car aren't functioning properly and you want to check the voltage, use the help of a Voltmeter. If the battery's reading is lower than 3 Volts, it's time to replace it. You can purchase the replacement battery in any auto parts store or electronics center.