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Citroen C3 Key Fob TroubleshootingKey fobs from Citroen can stop working due to a variety of reasons. This includes worn buttons, poor contact between the battery and the water and receiver module issues. Check the 12 volt battery.Deprogramming is a possible cause the key fob's inability to unlocking your car. 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 your Citroen C3's key fob is not working The first thing you need to examine is whether the battery is dead. The batteries in the fobs are small, round coins that can be easily changed in a matter of seconds. These can be found in general stores, home improvements stores and auto parts stores. Be citroen replacement key fob to purchase the correct battery, however. Fobs usually require CR2025 or CR2032 However, you should consult your owner's manual to determine the exact type of battery your vehicle requires.Before replacing the battery, take off the button pad and rub it using cotton swabs and alcohol. They will remove the corrosion, and clean the contacts, which are typically gold-colored. Once the contacts are cleaned, it is now time to install the new battery. Be careful not to mix up the two batteries as they have different voltages, diameters and shapes.Next, you will need to test the voltage of the battery. You can get an accurate reading using a multimeter that is set to the battery voltage range. If the battery shows a value above or below its threshold, it is required to be replaced. You can also start your vehicle using a spare key. However, this may not always work. If the problem persists go to a CITROEN dealership with your V5 registration as well as personal identity documents. A CITROEN Dealer can obtain the code for your vehicle's immobiliser and can order a new battery.Water damageIf the key fob falls under water, it could lose its signal to the car. It is best to remove it as soon as you can from the puddle or pool. After that then use the cotton swab along with isopropyl or electronic cleaner to dry the circuit board. If the key fob still does not work, it may be time to invest in another one.Another reason that is commonly cited for Citroen remote control c3 not working is signal interference. This can happen when there is an electrical field close to the car or other transmitters on the same frequency. Once you leave the interference area, your key fob will start working again.Finally, the Citroen C3 key fob may be inoperable due to worn buttons or signal interference, receiver module issues, a dead 12 volt battery, or a damaged electronic chip. If this happens, you'll probably require it to be reset by a professional. This can be done by a skilled mechanic or at an Citroen dealership. If the issue is significant, you may need to replace the device. It's a simple and inexpensive fix, but it's crucial to act fast. The longer you wait to correct the issue the more deteriorated it becomes. If the issue isn't resolved, it can be dangerous for the passengers and yourself.Issue with the Receiver moduleIf your key fob stops working, it could be due to the receiver module having developed a fault. This could be due to various factors like water damage. This can happen if drop your keys or wash them. You can try to fix the problem by removing and cleaning the chip using isopropyl ethanol or electronic cleaner. This will keep the chip from corrosion.You can also reset the receiver module by disconnecting it from the car battery, and waiting for 10 minutes. Then, reconnect the battery to the car and repeat the process. If this does not fix the issue, take it to a dealer to have it replaced.Interference can also cause your key to stop working. This could be caused by other transmitters that operate on the same frequency as your key fob, or by objects in your vehicle. If you're unable fix the problem, you can visit a dealer to have your key fob 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 is not accurate the receiver won't recognize the car key and display a message stating "key not detected". This can be a gruelling issue, especially if you're trying to start your vehicle.Dead 12 volt batteryIt is possible that the key fob you have purchased has been damaged if it ceases to function after changing batteries. This is most likely to happen if your key fob has been dropped or stepped upon or stepped on, but it could also occur 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, it might require replacement.A fob that is receiving interference from other devices and locations is a different possibility. This can make the RF signals weaker and block the car from recognizing the remote. If this is the case, you can reset all computer systems on board by disconnecting the battery that is 12 volts for approximately 15 minutes. This will remove any residual electricity, allowing the system to restart.Before replacing the battery, it is essential to ensure it's of the correct size and type. The circuit board on the key fob can be damaged in the event that the replacement battery is too big or has an incompatible voltage. You should also clean any corrosive materials from the chip in the fob prior to installing a new battery. The correct battery type will ensure that the key fob is sealed and protected against moisture. Once the key fob is replaced, it should work normal. In most cases, you can use the second key to start your car in the event that it displays a message of "key not recognized." It is possible to press the button a few times before it responds.