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Citroen C3 Key Fob TroubleshootingCitroen c3 key fob can not function for various reasons. There are a variety of reasons, including worn buttons or poor contact with the battery, water damage and receiver module problems. You should also examine the battery's 12 volts.Deprogramming could be the reason that your key fob isn't unlocking your car. This happens when certain button sequences send an alert to the onboard computer to remove the key from its access list.Dead coin batteryIf the fob that you use to open the door on your Citroen C3 is no longer working, check first if the battery has gone out. Fobs use small coin-shaped batteries which can be replaced within a few minutes. They can be found in general stores, home improvements stores and auto parts stores. Make sure you purchase the correct model, however. Batteries for fobs are usually CR2025 or CR2032, however you should check the owner's manual of your vehicle to determine which kind of battery is needed.Take off the button pad and use cotton swabs and alcohol to clean it. This will help to remove corrosion and clean the contacts which are typically colored gold. After the contacts have been cleaned then you can put in the new battery. Be careful not to mix the two batteries because they have different voltages and sizes.Next, you will need to assess the voltage of the battery. citroen van key replacement that is set to the battery's voltage range should provide a precise reading. If the battery's voltage is above or below threshold, it needs to be replaced. You can also start your car using a spare key. However, this might not always work. If the problem persists visit a CITROEN dealership with your V5 registration as well as personal identity documents. A CITROEN dealer can locate the code for your vehicle's immobiliser system and request a replacement battery.Water damageIf the key fob is underwater it may lose its signal to the car. If this happens, it's a good idea to get it out of the puddle, pool, or washing machine as quickly as possible. After that dry the circuit board in the best way you can with the help of a cotton swab, dipped into isopropyl alcohol or electronic cleaner. If it doesn't work It could be the time to replace your key fob.Signal interference is a common reason for Citroen remote control not working. This can happen when there is an electrical signal near the vehicle or other transmitters on the same frequency. Once you have left the interference area your key fob will begin working again.The Citroen C3 key fob may stop working because of worn buttons, signal interference issues, receiver module issues as well as a dead 12-volt battery, or a defective chip. If this happens, you'll likely need to get it replaced by a skilled technician. This can be done either by a qualified mechanic or a Citroen dealer. If the issue is significant the vehicle will need to be it replaced. It's a relatively easy and affordable fix. But you must get it done quickly. The longer you put off taking action to address the issue, the more severe it will be. It could pose a risk to passengers and yourself in the event that the issue isn't addressed.Receiver Module IssueIf your key fob isn't working, the receiver module may have developed an issue. This could be due to many things, including water damage. It can happen when you accidentally drop your keys or wash them. You can solve the problem by removing your chip and cleaning it with isopropyl and electronic cleaner. This will help to keep the chip from getting damaged.You can also reset the receiver module when you disconnect it from the battery and then wait 10 seconds. Then reconnect the battery to the vehicle and repeat the process. If this doesn't solve the issue, visit a dealership to have it replaced.Another reason why your key might be unable to function is due interference. This could be caused by other transmitters that utilize the same frequency as your key fob or by objects in your vehicle. If you are unable to resolve the problem, you can visit a dealer and 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 isn't right it will not recognize the car key and display a message that reads "key not recognized". This could be a major issue particularly when trying to start your vehicle.Dead 12 volt batteryIf your key fob stops working after changing the battery It could be damaged. This is especially true if the key fob was dropped or stepped upon, but it also can occur after maintenance on your vehicle that requires removal and reinstallation of the panels. When these panels are removed, the wires are exposed. If your fob has been damaged, it might need to be replaced entirely.Another possibility is that the fob receives interference from other devices or locations. The RF signals can cause to become weak and prevent the car from acknowledging the remote. It is possible to reset the onboard computer in this scenario by disconnecting your 12-volt battery for 15 minutes. This will erase any remaining electric current, allowing your system to restart.It is important to check the size and quality of the battery prior to replacing it. If the battery you replace is too small or has an incompatible voltage, it can damage the circuit board in the key fob. Before installing a battery you should clean the chip inside the fob to eliminate any harmful substances. The right battery type can ensure that the key fob is properly sealed and shielded from moisture. Once the key fob is been reinstalled, it will function normally. In the majority of instances, you will be able to use the second key to start your vehicle even if it shows an error message that reads "key not recognized." It may be necessary to press the button a few times before it responds.