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Citroen C3 Key Fob TroubleshootingCitroen c3 key fobs can stop working due to a variety of reasons. Some of these include worn buttons and poor contact with the battery, water damage, and receiver module issues. You should also check the battery’s 12 volts.Deprogramming could be the reason the key fob’s not unlocking your car. This happens 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 key fob on your Citroen C3 is no longer working, check first if the battery has failed. The batteries contained in the fobs are small round coins that can be easily replaced in just a few minutes. They are available at general stores, home improvement stores, and a few auto parts stores. Be sure to buy the correct model. Fobs typically require CR2025 or CR2032 however, you must refer to the owner’s manual of your vehicle to determine the kind of battery your vehicle requires.Remove the button pad, and use cotton swabs and alcohol to clean it. This will help remove corrosion, and clean the contacts, which are usually gold-colored. Once the contacts have been cleaned, you are able to install the new battery. Just be careful not to mix the two kinds because they have different voltages and sizes.The next step is to assess the voltage of the battery. A multimeter that is calibrated to the battery’s voltage range will provide you with a precise reading. If the battery’s reading is in the middle or above the threshold, it should be replaced. You could also start your car using a spare key. However, this might not always work. If the issue continues, visit an CITROEN dealership with your V5 registration and personal identification documents. A CITROEN dealer can locate the code for your vehicle’s immobiliser system, and get a replacement battery.Water damageIf the key fob is underwater it may lose its signal to the car. If this happens, it’s a great idea to fish it out from the pool, puddle or washing machine as soon as you can. Once you do dry the circuit board as best you can with a cotton swab dipped in isopropyl alcohol, or electronic cleaner. If the key fob does not work, it may be time to purchase another one.Signal interference is a common reason for Citroen remote control not working. This can occur when there is an intense electrical field near the car, or from other transmitters operating on the same frequency. citroen berlingo key replacement TheKeyLab should start to work again once you are out of the zone of interference.The Citroen C3 key fob can stop working because of worn buttons signals, signal interference issues receiver module issues as well as a dead 12-volt battery, or a defective chip. It will need to be reprogrammed when this happens. This can be done either by a certified mechanic or an Citroen dealer. If the issue is severe then you’ll have to get it replaced. It’s a relatively easy and affordable fix. But you should take action quickly. The longer you wait to fix the issue, the worse it becomes. It could be dangerous for passengers and yourself in the event that the issue isn’t addressed.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 several things that include water damage. This could happen if you accidentally drop your keys or wash them. You can fix the issue by taking off and cleaning the chip with isopropyl alcohol, or electronic cleaner. This will help to stop the chip from corroding.You can also try to reset the receiver module by disconnecting it from the car battery and letting it sit for 10 minutes. You can then reconnect the battery and repeat the process. If this doesn’t fix the issue, you can visit a dealership to have it replaced.Interference can cause your key to stop working. This could be caused by other transmitters using the same frequency as your key fob or by objects within your vehicle. If you’re not able to fix the issue, take 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 right it will not recognize the car key and display a message stating “key not detected”. This can be a frustrating problem especially when trying to start your car.Dead 12 volt batteryIt is possible that your key fob may have been damaged if it ceases to function after changing batteries. This is particularly true in the event that the key fob was dropped or stepped on, but it can also happen following maintenance on your vehicle which requires the removal and reinstallation of panels. Wires are exposed when the panels are removed. If your fob has been damaged, it may require replacement.A fob that receives interference from other devices and locations is a different possibility. This can make RF signals weaker and hinder the car from being able to recognize the remote. You can reset the on-board computer in this situation, by disconnecting the 12-volt battery for 15 minutes. This will erase any remaining electrical energy, allowing the system to reboot.It is essential to confirm the size and type of the battery before replacing it. If the replacement battery isn’t big enough or has different voltage, it could harm the circuit board inside the fob’s key. Before installing a battery, you should clean the chip inside the fob to remove any corrosive substances. Making sure you choose the right battery will ensure that it is sealed and shielded from moisture. Once the key fob has been installed, it should work normally. In the majority of instances, you will be able to use the second key to start your car even when it displays a message of “key not detected.” You may need to press the button a few times before it responds.