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Citroen C3 Key Fob TroubleshootingCitroen c3 key fobs can cease to function due to different reasons. These include worn buttons poor battery contact, water damage and receiver module issues. Also, you should check the 12 volt battery.If the key fob can not unlock your car, you might be experiencing deprogramming. 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 C3's keys fob no longer works The first thing you need to look for is if the battery is dead. Fobs are small coins-shaped batteries that can be replaced in a few minutes. They are available in general stores, home improvements stores and auto parts stores. Make sure you purchase the correct type, though. The majority of fobs require CR2025 or CR2032, but you should consult your owner's manual to determine the exact type of battery that your car requires.Take off the button pad and then use cotton swabs or alcohol to clean it. They will remove the corrosion and clean the contacts, which are usually colored gold. Once the contacts are cleaned, you can insert the new battery. Just be careful not to mix the two batteries because they have different diameters and voltages.Next, you will need to test the voltage of the battery. A multimeter that is set to the battery's voltage range will give you a reliable reading. If the battery has the value that is either above or below its threshold, it will need to be replaced. citroen ds3 key fob replacement can also start your vehicle using a spare key. However, this might not always work. If the issue persists, go to a CITROEN dealership with your V5 registration and identification documents. A CITROEN dealer can retrieve the code for your vehicle's immobiliser and get a replacement battery.Water damageIf the key fob is submerged, it can lose its signal. If this happens, it's a good idea to remove it from the pool, puddle or washing machine as quickly as possible. Once you've done that using a cotton swab, isopropyl or electronic cleaner to dry the circuit board. If the key fob doesn't function, it might be time to invest in an entirely new one.Another reason that is commonly cited one of the main reasons for Citroen c3 remote control not working is signal interference. This can happen when there is an electrical field in the vicinity of the vehicle or other transmitters that operate on the same frequency. The key fob will begin to function again after you have left the area of interference.The Citroen C3 key fob could stop working because of worn buttons signals, signal interference issues receiver module issues or a dead battery or a defective chip. If this happens, you'll probably have to have it reprogrammed by an expert. This can be done by a trained mechanic or at a Citroen dealership. If the issue is severe you may have to replace the device. This is a relatively simple and cost-effective fix, however it's essential to act quickly. The longer you wait to fix the issue, the worse it becomes. If the issue isn't resolved the issue could be a hazard for the passengers and yourself.Receiver Module IssueIf your key fob stops working, it might be because the receiver module has developed a fault. This could be due to many things that include water damage. It can happen when you accidentally drop your keys or wash them. You can attempt to resolve the issue by removing and cleaning the chip with isopropyl ethanol or electronic cleaner. This will help to keep the chip from getting damaged.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 car and repeat the procedure. If this doesn't resolve the issue, you can go to a dealer to have it replaced.Interference can also cause your key to stop working. It could be caused by other transmitters on the same frequency or objects in your vehicle. If you're unable to fix the issue, visit a dealer to change the key fob's programming.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 in order, the receiver module will not recognize the key and will display a key not detected message. This can be a frustrating problem, especially when you're trying to start your vehicle.Dead 12 volt batteryIf your key fob stops working after the battery has been changed It could be damaged. This is especially true if the key fob was dropped or stepped on, but it can also happen following servicing on your car that requires removal and reinstallation of panels. When the panels are removed, the wires are exposed. If your fob is damaged, you might require replacement completely.Another possibility is that the remote is receiving interference from other devices or places. This could make RF signals weaker and hinder the car's recognition of the remote. If this is the case you can reset all on-board computers by disconnecting the 12 volt battery for approximately 15 minutes. This will take away any remaining electricity, allowing the system to restart.Before replacing the battery it's important to make sure it's of the correct size and type. If the replacement battery isn't big enough or has an incompatible voltage, it can damage the circuit board inside the key fob. Also, you should clean any corrosive materials from the chip in the fob prior to installing a new battery. Using the right battery will ensure that it is properly sealed and protected from moisture. After the key fob has been installed, it should work normally. You should be able to use the second key even if your car displays a message that says "key not found." It is possible to press the button several times before it responds.