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Citroen C3 Key Fob TroubleshootingCitroen key fobs can not function due to a number of causes. The most common reasons are worn buttons that are not in contact with the battery, water damage, and receiver module problems. Also, you should check the 12 volt battery.If the key fob will not unlock your car, you may be experiencing deprogramming. This happens when certain button combinations send an electronic message to the computer requesting 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 working, first determine if the battery has gone out. The batteries in the fobs are tiny, round coins that can be easily replaced within a few moments. These can be found in general stores, home improvement stores and auto parts stores. Be sure to purchase the correct type, though. Fobs typically require CR2025 or CR2032 However, you should refer to the owner’s manual of your vehicle to determine the exact type of battery that your car requires.Remove the button pad, and then use cotton swabs or alcohol to clean it. This will help remove corrosion and clean the contacts which are typically colored gold. After the contacts have been cleaned, you can put in the new battery. Be careful not to mix the two types because they have different voltages and sizes.Next, you will need to assess the voltage of the battery. A multimeter set to the battery’s voltage range should provide you with a precise reading. If the battery has the value that is either above or below its threshold, it needs to be replaced. You could also start your car using a spare key. However, this might not always work. If the problem persists, visit an CITROEN dealer with your V5 registration documents and personal identifi cation documents. A CITROEN dealer can retrieve the code for your vehicle’s immobiliser and purchase an alternative battery.Water damageIf the key fob is submerged, it may lose its signal. It is advised to remove it as fast as you can from the puddle or pool. After this, use the cotton swab along with isopropyl or electronic cleaner to clean the circuit board. If it still doesn’t work, it may be time for a new key fob.Signal interference is another common reason for Citroen remote control not working. This can happen when there is an electrical field in the vicinity of the car or other transmitters using the same frequency. Once you leave the interference area the key fob will start working again.The Citroen c3 key fob can be inoperable due to worn buttons or signal interference, receiver module issues, a dead 12 volt battery, or a defective electronic chip. You’ll need it changed to a new program when this happens. This can be done by a certified mechanic or at an Citroen dealership. If the issue is serious it’s time to have it replaced. This is a simple and inexpensive fix, but it’s imperative to act swiftly. The longer you put off fixing the problem, the worse it gets. If the issue doesn’t get resolved it could pose a danger for passengers and you.Issue with the Receiver moduleIf your key fob is not functioning the receiver module could have developed an issue. This could be due to many things like water damage. It can happen when you drop your keys, or wash them. It is possible to repair the issue by removing the chip and cleaning it with isopropyl or an electronic cleaner. This will stop the chip from getting corroded.You could also try to reset the receiver module by disconnecting it from the car battery and waiting for 10 seconds. Then, reconnect the battery to the car and repeat the procedure. If this fails to fix the issue, you can visit a dealership to have it replaced.Another reason why your key might be unable to function is due interference. TheKeyLab could be caused by other transmitters that operate on the same frequency as your key fob or by objects inside your vehicle. If you are unable to fix the issue, bring your key fob to a dealer to be changed to a different frequency.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 correct the receiver will not recognize the car key and display a message telling you “key not recognized”. This could be a major issue especially when trying to start your car.Dead 12 volt batteryIt is possible that your key fob may have been damaged if it stops working after a change in batteries. This is more frequent when the key fob been thrown around or stepped on, but can also happen after a service that requires the removal of panels and then reinstallation. When these panels are removed, the wires are exposed. If your fob is damaged, you might require replacement completely.Another possibility is that the remote is receiving interference from other devices or locations. This could cause RF signals to weaken and block the car from recognizing the remote. If this is the case, you can reset all on-board computers by disconnecting the battery at 12 volts for about 15 minutes. This will remove any residual power, allowing the system to reboot.It is important to check the size and quality of the battery before replacing it. If the replacement battery is too small or has different voltage, it could damage the circuit board in the key fob. Also, you should clean any corrosive material from the chip in the fob prior to installing a new battery. Making sure you choose the right battery will ensure that it is sealed and shielded from moisture. After the key fob has been replaced, it should work normal. You should be able to use the second key even if your car displays a message that says “key not detected.” It might be necessary to press the button multiple times before it responds.