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Citroen C3 Key Fob TroubleshootingKey fobs from Citroen can stop working due to a number of reasons. There are a variety of reasons, including worn buttons, poor contact with the battery, water damage, and receiver module problems. You should also examine the battery's 12 volts.If the key fob does not unlock your car, it could be experiencing deprogramming. This occurs when certain button combinations send a message to the onboard computer asking that the key be removed from its list of keys.Dead coin batteryIf your Citroen C3's main fob has stopped working the first thing you should examine is whether the battery is dead. Fobs have small coins-shaped batteries that can be replaced in a few minutes. They are available at home improvement stores, and a few auto parts stores. Be sure to 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 type is required.Remove the button pad, and then use cotton swabs or 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 it is time to insert the new battery. Be careful not to mix up the two batteries as they have different voltages, dimensions, and shapes.Next, you will need to assess the voltage of the battery. A multimeter calibrated to the battery's voltage range should provide you with a precise reading. If the battery's value is either above or below the threshold, then it needs to be replaced. You can also start your car using a spare key. However, this may not always work. If the problem persists go to a CITROEN dealer with your V5 registration certificate and personal identifi cation documents. A CITROEN dealer can obtain the code for the immobiliser on your vehicle and order a replacement battery.Water damageIf the key fob is under water, it could lose its signal to the car. If this occurs, it's a good idea to get it out of the puddle, pool, or washing machine as soon as you can. Once you've done that make use of a cotton swab, isopropyl or electronic cleaner to clean the circuit board. If the key fob doesn't function, it might be time to purchase a new one.Another common cause that can be the reason behind Citroen c3 remote control not working is signal interference. This can occur when there is an electrical field close to the vehicle or other transmitters using the same frequency. The key fob will begin working once you leave the area of interference.The Citroen C3 key fob might stop working because of worn buttons signals, signal interference issues receiver module problems or a dead battery, or a defective chip. You'll need to have it reprogrammed in the event of this. This can be accomplished by a qualified mechanic or an Citroen dealer. If the issue is significant then you'll have to get it replaced. It's a relatively easy and inexpensive fix. But you should be quick to act. citroen replacement key cost wait to fix the issue, the worse it gets. If the issue isn't fixed it could pose a danger for the passengers and yourself.Receiver Module IssueIf your key fob stops functioning, it could be because the receiver module has developed a fault. This could be due to several things such as water damage. This can occur when you drop your keys, or wash them. You can fix the problem by taking off the chip and cleaning it with isopropyl or an electronic cleaner. This will prevent the chip from getting corroded.You could also try to reset the receiver module by disconnecting it from the car battery and letting it sit for 10 minutes. Then, reconnect the battery and repeat the process. If this doesn't fix the issue, you can go to a dealership and have it replaced.Another reason your key could not work is due to interference. This can be caused by other transmitters that use the same frequency as your key fob, or by objects within your vehicle. If you're unable to fix the problem, you can go to a dealership 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 isn't correct the receiver will not recognize the car key and display a message that reads "key not recognized". This could be a major issue, especially when trying to start your vehicle.Dead 12 volt batteryIt is possible that your key fob is damaged if it stops working after changing batteries. This is especially common when the key fob has been dropped or stepped upon, but it could also occur following maintenance on your vehicle that requires the removal and reinstallation of the panels. When the panels are removed, the wires are exposed. If your fob has been damaged, it may need to be replaced entirely.A fob that receives interference from other devices or locations is a second possibility. This could make RF signals weaker and hinder the car from recognizing 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 electrical energy, allowing the system to reboot.Before replacing the battery it's crucial to ensure it's the correct size and type. If the battery you replace is too small or has an incompatible voltage, it could damage the circuit board within the key fob. Before installing a new battery, you must clean the chip inside the fob to eliminate any contaminants that could cause corrosion. The correct type of battery can ensure that the key fob is properly sealed and shielded from moisture. After the key fob has been installed, it will function normal. In the majority of cases, you can use the second key to start your car even in the event that it displays a message of "key not found." It might be necessary to press the button multiple times before it responds.