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Citroen C3 Key Fob TroubleshootingCitroen key fobs might stop working due to a number of reasons. The most common reasons are worn buttons that are not in contact with the battery, water damage and receiver module problems. Also, you should check the 12 volt battery.If the key fob can not unlock your car, you could be experiencing deprogramming. This occurs when certain buttons send an alert 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 use small coins-shaped batteries that can be replaced in just a few minutes. They are available in general stores, home improvement stores and auto parts stores. Be citroen c4 replacement key to purchase the correct type, though. For fobs, batteries are typically CR2025 or CR2032, however, you should consult the owner's manual of your vehicle to determine which type is required.Take off the button pad and then use cotton swabs or alcohol to clean it. This will help remove corrosion and clean the contacts, which are typically colored gold. Once the contacts have been cleaned then you can put in the new battery. Be cautious not to mix the two types as they differ in voltage, sizes and diameters.The next step is to test the battery's voltage. A multimeter that is set to the battery's voltage range will provide a precise reading. If the battery's voltage is in the middle or above the threshold, then it must be replaced. You may also try to start your car using a spare key, however it may not be effective in all cases. If the issue continues then visit a CITROEN dealer with your V5 registration certificate and personal identifi cation documents. A CITROEN Dealer can retrieve the code for the immobiliser on your vehicle and purchase new batteries.Water damageIf the key fob is submerged, it can lose its signal. If this occurs, it's a good idea to get it out from the pool, puddle or washing machine as quickly as you can. After this then use an swab of cotton and isopropyl or electronic cleaner to dry the circuit board. If the key fob still isn't working, it could be time to buy an additional one.Another common cause one of the main reasons for Citroen remote control c3 not working is signal interference. This could happen when there is an intense electrical field close to the vehicle, or from other transmitters on the same frequency. Once you leave the interference area the key fob will be working normally again.The Citroen C3 key fob could be inoperable due to worn buttons problems with signal interference, receiver module issues, a dead 12-volt battery or a damaged chip. If this happens, you'll likely have to have it changed by a certified expert. This can be accomplished by a trained mechanic or an Citroen dealer. If the issue is serious it's time to have it replaced. This is a relatively simple and affordable fix, but it's crucial to act fast. The longer you put off taking action to correct the issue the more deteriorated it becomes. If the issue isn't resolved, it can be dangerous for you and your passengers.Receiver Module IssueIf your key fob ceases working, it could be due to the receiver module having developed a fault. This could be due to many things such as water damage. This can happen if you drop your keys, or wash them. You can try to resolve the issue by removing and cleaning the chip with isopropyl alcohol or an electronic cleaner. This will prevent the chip from corroding.You can also reset the receiver module when you disconnect it from the battery, and wait 10 seconds. You can then reconnect the battery and repeat the procedure. If this does not resolve the issue, take it to a dealer to be repaired.Interference can also cause your key to stop working. It could be caused by other transmitters that operate on the same frequency or objects in your vehicle. If you're unable to fix the issue, go to a dealership 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 is not accurate the receiver will not recognize the car key and display a message stating "key not detected". This can be a frustrating problem particularly when trying to start your vehicle.Dead 12 volt batteryIf your key fob stops working after an upgrade to a battery it could be damaged. This is most likely to happen when your key fob has been thrown around or stepped on however, it can also be the result of a service that requires the removal of panels and then reinstallation. When the panels are removed, wires are exposed. If your fob is damaged, you may require replacement completely.A remote that is receiving interference from other devices and locations is also a possibility. The RF signals can cause to weaken and block the car from being able to recognize the remote. If this is the case it is possible to reset all computer systems on board by disconnecting the battery that is 12 volts for approximately 15 minutes. This will eliminate any remaining electric current, allowing your system to reboot.It is essential to verify the size and quality of the battery before replacing it. The circuit board that is inside the key fob can be damaged if the replacement battery is too large or has a different voltage. You should also remove any corrosive material from the chip inside the fob prior to installing the new battery. Using the correct type of battery can help ensure that it is properly sealed and protected from moisture. After the key fob has been reinstalled, it should function normally. You should be able to use the second key even if your car displays a message saying "key is not recognized." It is possible to press the button several times before it responds.