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Citroen C3 Key Fob TroubleshootingCitroen c3 key fob can stop working for different reasons. These include worn buttons, poor contact between the battery and the water and issues with the receiver module. Make sure the batteries are 12 volts.Deprogramming could be the reason that your key fob isn’t unlocking your car. This happens when certain key sequences send a signal to the onboard computer to erase the key from its list of access.Dead coin batteryIf your Citroen C3’s main fob isn’t working, the first thing to determine is if the battery is dead. Fobs use small, coin-shaped batteries that can be replaced in a few minutes. They are available at general stores, home improvement stores, as well as some auto parts stores. Make sure you purchase the correct one, however. Batteries for fobs are typically CR2025 or CR2032, however you must consult the owner’s manual for your vehicle to determine which type is required.Remove the button pad and then use cotton swabs or alcohol to clean it. This will help remove corrosion and clean the contacts that are usually gold colored. After cleaning the contacts and sanitized, you can then insert the new battery. Just be careful not to mix the two batteries because they differ in their voltages and diameters.The next step is to check the voltage of the battery. You can get an accurate reading using a multimeter that is calibrated to the battery’s voltage range. If the battery is at an amount that is above or below its threshold, it is required to be replaced. Try starting your car with a spare key, however this might not work in all cases. If the issue persists you should visit an CITROEN dealer with your V5 registration document and personal identifi cation documents. A CITROEN Dealer can locate the code for your vehicle’s immobiliser, and then order new batteries.Water damageWhen the key fob gets underwater it may lose its signal to the car. If this happens, it’s a good idea to remove it of the puddle, pool or washing machine as quickly as you can. After this make use of the cotton swab along with isopropyl or electronic cleaner to clean the circuit board. If the key fob isn’t working, it may be time to get an additional one.Signal interference is a common cause of Citroen remote controls not working. It can happen when there is an electrical field in the vicinity of the car or other transmitters on the same frequency. The key fob is expected to begin to work again once you have left the zone of interference.Additionally, the Citroen C3 key fob might cease to function due to worn buttons and receivers, signal interference, module issues and a dead 12 volt battery, or a damaged electronic chip. If citroen c4 key replacement The Keylab happens, you’ll likely need to get it reset by a professional. This can be done by a skilled mechanic or at a Citroen dealership. If the issue is severe it may be necessary to replace the device. It’s a simple and inexpensive fix. But you have to act quickly. If you put off fixing the issue, the worse it gets. It could pose a risk to passengers and yourself in the event that the issue isn’t fixed.Receiver Module IssueIf your key fob ceases functioning, it could be due to the receiver module having developed a fault. This could be due to various factors, including water damage. It can happen when you drop your keys or wash them. It is possible to solve the problem by removing your chip and cleaning it with isopropyl or electronic cleaner. This will stop the chip from getting corroded.You can also try to reset the receiver module by disconnecting it from the car battery and waiting for 10 minutes. You can then reconnect the battery and repeat the process. If this doesn’t resolve the issue, go to a dealer to have it replaced.Another reason your key could be unable to function is due interference. It could be caused by other transmitters that use the same frequency as your key fob, or by objects within your vehicle. If you’re unable to fix the problem, you can go to a dealership to change the key fob’s programming.The key fob contains a short-range radio transmitter/radio-frequency identification (RFID) chip and antenna, which sends a distinct coded signal to the receiver module in your car. If the signal is not right the receiver will not recognize the car key and display a message telling you “key not detected”. This could be a very frustrating issue, especially if you’re trying to start your vehicle.Dead 12 volt batteryIf your key fob ceases working after a battery change It could be damaged. This is most likely to happen if the key fob was dropped or stepped on. However, it can also happen following maintenance on your vehicle that requires removal and reinstallation of panels. When these panels are removed, the wires are exposed. If your fob has been damaged, it may need to be replaced entirely.A fob that receives interference from other devices and locations is a different possibility. This could cause RF signals to weaken, preventing the car from recognizing the remote. If this is the case it is possible to reset all computer systems on board by disconnecting the battery at 12 volts for about 15 minutes. This will erase any remaining electrical energy, allowing the system to reboot.It is essential to verify the size and quality of the battery before replacing it. The circuit board on the fob’s key could be damaged when the battery you replace is too large or has an unrelated voltage. It is also recommended to clean any corrosive materials off the chip inside the fob before installing the new battery. The correct battery type will ensure that the key fob is properly sealed and protected from moisture. Once the key fob is reinstalled, it should work normal. In most instances, you will be able to use the second key to start your car even if it shows an error message that reads “key not recognized.” You may have to press the button several times before it responds.