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Citroen C3 Key Fob TroubleshootingKey fobs from Citroen can malfunction due to a variety of reasons. Some of these include worn buttons that are not in contact with the battery, water damage, and receiver module issues. You should also check 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 instruction to the computer in the car to delete the key from its list of access.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 failed. Fobs have small coins-shaped batteries that can be replaced in just a few minutes. They are sold in general stores, home improvements stores, and auto parts stores. Be sure to buy the right type. Fobs typically require CR2025 or CR2032 however, you must refer to the owner's manual of your vehicle to determine the type of battery your vehicle requires.Before you replace the battery, remove the button pad and rub it using cotton swabs and alcohol. This will help remove corrosion, and clean the contacts, which are usually gold colored. Once the contacts are cleaned, you are able to install the new battery. Just be careful not to mix the two batteries because they have different voltages and sizes.The next step is to test the voltage of the battery. You can get an accurate reading using a multimeter that is set to the battery's voltage range. If the battery's current value is in the middle or above the threshold, it should be replaced. You could also try getting your car started using an extra key, but it may not be effective in all cases. If the issue continues, visit a CITROEN dealer with your V5 registration documents and personal identification documents. A CITROEN dealer can obtain the code for your vehicle's immobiliser system and get the replacement battery.Water damageIf the key fob is submerged, it can lose its signal. If this happens, it's a good idea to get it out from the pool, puddle or washing machine as soon as possible. After you've done this then use a cotton swab, isopropyl or electronic cleaner to dry the circuit board. If the key fob isn't working, it may be time to get another one.Signal interference is another common reason for Citroen remote control not working. It can happen when there is an electrical field close to the vehicle or other transmitters operating on the same frequency. The Key Lab is expected to begin working again after you are out of the zone of interference.The Citroen C3 key fob could not function because of worn buttons or signal interference issues, receiver module issues or a dead 12-volt battery or a defective chip. You'll need to have it replaced if this happens. This can be done by a qualified mechanic, or an Citroen dealer. If the issue is severe the vehicle will need to be it replaced. It's a simple and affordable fix, but it's important to act quickly. The longer you take to address the issue, the more deteriorated it becomes. If the problem isn't addressed the issue could be a hazard for passengers and you.Receiver module issueIf your key fob is not working, the receiver module may have developed a fault. Water damage is one of the numerous causes. This could happen if you lose your keys or wash them. You can fix the issue by taking off and cleaning the chip using isopropyl alcohol, or electronic cleaner. This will keep the chip from getting corroded.You can 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 vehicle and repeat the process. If this doesn't fix the issue, go to a dealer to have it replaced.Interference can also cause your key to stop working. It can be caused by other transmitters on the same frequency or by objects in your vehicle. If you are unable to resolve the problem, you can visit a dealer to have your key fob reset.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 doesn't match the receiver module won't recognize the key and will display the message "Key not detected. This could be a major issue especially when you attempt to start your car.Dead 12 volt batteryIt is possible that the key fob you have purchased has been damaged if it stops working after a change in batteries. This is especially common when the key fob has been dropped or stepped on, however it can also happen after servicing on your car that requires removal and reinstallation of panels. When these panels are removed, the wires are exposed. If your fob is damaged, you may have to replace it completely.Another possibility is that the remote is receiving interference from other devices or places. This can cause RF signals to become weaker and block the car from being able to recognize the remote. It is possible to reset the onboard computer if this is the situation by disconnecting the 12-volt battery for 15 minutes. This will take away any remaining electric current, allowing your system to reboot.Before replacing the battery it is essential to ensure it's the correct size and type. If the replacement battery isn't big enough or has different voltage, it could damage the circuit board inside the fob's key. Also, you should clean any corrosive material from the chip in the fob prior to installing the new battery. Using the correct type of battery can help ensure that it is sealed and shielded from moisture. Once the key fob is been reinstalled, it will function normally. In most instances, you will be able to use the second key to start your car even when it displays a message saying "key not found." You may need to press the button a few times before it responds.