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Citroen C3 Key Fob TroubleshootingCitroen c3 key fobs can cease to function due to various reasons. These include worn buttons, poor contact between the battery and the water, and receiver module issues. Also, you should check the 12 volt battery.If the key fob can not unlock your car, you may be experiencing deprogramming. This occurs when certain buttons send a message to the onboard computer, asking that the key be removed from its list of keys.Dead coin batteryIf the fob that you use to open the door on your Citroen C3 is no longer functioning, first check if the battery has gone out. The batteries that are in the fobs are small round coins that can be replaced in just a few minutes. They are sold in general stores, home improvements stores and auto parts stores. Make sure you purchase the correct type, though. For fobs, batteries are typically CR2025 or CR2032, however you should check the owner's manual of your vehicle to determine what kind of battery is needed.Before you replace the battery, remove the button pad and rub it using cotton swabs and alcohol. They will remove the corrosion and clean the contacts which are typically colored gold. Once the contacts have been cleaned, you are able to install the new battery. Be cautious not to mix the two batteries as they have different voltages, dimensions, and shapes.The next step is to check the battery's voltage. You can get a reliable reading using a multimeter, which is calibrated to the battery's voltage range. If the battery is at a value above or below its threshold, it is required to be replaced. You can also start your car using a spare key. However, this may not always work. If the issue continues then visit an CITROEN dealer with your V5 registration certificate and personal identifi cation documents. A CITROEN Dealer can locate the code for your vehicle's immobiliser, and then order new batteries.citroen key replacement costWhen the key fob goes underwater it may lose its signal to the car. It is best to remove it as soon as you can from the pool or puddle. After this using an swab of cotton and isopropyl or electronic cleaner to clean the circuit board. If the key fob still doesn't function, it might be time to purchase another one.Signal interference is a different cause of Citroen remote controls not working. This can happen when there is an electrical signal near the car or other transmitters that operate on the same frequency. The key fob should begin working again after you leave the zone of interference.Additionally, the Citroen C3 key fob could be inoperable due to worn buttons or signal interference, receiver module issues or a dead 12 Volt battery, or an indefective electronic chip. You'll have to get it reset when this happens. This can be done by a skilled mechanic or at an Citroen dealership. If the issue is serious the vehicle will need to be it replaced. This is a simple and inexpensive fix, but it's imperative to act swiftly. The longer you wait to fix the issue, the more difficult it gets. It could be hazardous to passengers and you in the event that the issue isn't resolved.Receiver Module IssueIf your key fob ceases working, it could be because the receiver module has developed a fault. It could be caused by a number of things like water damage. It can happen when you drop your keys, or wash them. You can attempt to fix the problem by removing and cleaning the chip using isopropyl alcohol, or electronic cleaner. This will prevent the chip from becoming corroded.You can also reset the receiver module if you disconnect it from the battery, and wait 10 seconds. Then reconnect the battery to the car and repeat the process. If this doesn't solve the issue, you can go to a dealer to have it replaced.Another reason your key may stop working is due to interference. It could be caused by other transmitters that use the same frequency as your key fob, or by objects inside your vehicle. If you are unable to fix the issue, you can bring your key fob to an authorized dealer to have it reprogrammed.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 isn't in order, the receiver module won't recognize the key and will display an error message that states the key is not detected. This can be a frustrating issue, especially when trying to start your vehicle.Dead 12 volt batteryIt is possible that your key fob is damaged if it ceases to function after a change in batteries. This is more likely when your key fob has been thrown around or stepped on, but can also occur after a service that requires the removal of panels and the reinstallation. Wires are exposed when these panels are removed. If your fob is damaged, you may require a complete replacement.A remote that receives interference from other devices and locations is another possibility. This could cause the RF signals to become weak and prevent the car from understanding the remote. If this happens you can reset all computer systems on board by disconnecting the battery that is 12 volts for approximately 15 minutes. This will eliminate any remaining electricity and allow the system to restart over.Before replacing the battery it's crucial to ensure it's the correct size and type. If the battery you replace isn't big enough or has an unsuitable voltage, it could damage the circuit board within the key fob. Before installing a battery you should clean the chip of the fob to remove any corrosive substances. The correct type of battery can ensure that the key fob is sealed and shielded from moisture. After the key fob has been put back in place, it should function normal. It is possible to use the second key if your car displays a message saying "key not detected." It may be necessary to press the button multiple times before it responds.