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Citroen C3 Key Fob Troubleshooting The key fob of the Citroen C3 can stop working due to a variety of 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 check the 12 volt battery Deprogramming may be the cause that your key fob isnt unlocking your car This occurs when certain buttons send an electronic message to the computer requesting that the key be removed from its list of keys Dead coin battery If the key fob on your Citroen C3 is no longer functioning first check if the battery has failed The batteries contained in the fobs are tiny round coins that can be easily replaced within a few moments They can be found in general stores home improvements stores and auto parts stores Be sure to purchase the correct model however For fobs batteries are typically CR2025 or CR2032 However you should consult the owners manual for your vehicle to determine what type is required Take off the button pad and use cotton swabs and alcohol to clean it These will help remove corrosion and clean the contacts which typically have a gold color Once the contacts are cleaned then you can put in the new battery Just be careful not to mix the two types because they have different voltages and diameters The next step is to test the batterys voltage A multimeter that is set to the batterys voltage range should provide you with a precise reading If the battery shows an amount that is above or below its threshold it is required to be replaced You can also try starting your car with a spare key but it may not be effective in all cases If the problem persists visit an CITROEN dealership with your V5 registration and personal identification documents A CITROEN dealer can obtain the code for your vehicles immobiliser system and purchase the replacement battery Water damage When the key fob gets underwater it may lose its signal to the car If this occurs its a good idea to remove it of the pool puddle or washing machine as fast as you can Once youve done that using a cotton swab isopropyl or electronic cleaner to clean the circuit board If the circuit board is still not working It could be the time to replace your key fob Signal interference is a common reason for Citroen remote controls not working This may occur when there is an intense electrical field close to the vehicle or from other transmitters on the same frequency When you leave the area of interference your key fob will be working normally again The Citroen C3 key fob can stop working because of worn buttons signals signal interference issues receiver module issues a dead 12volt battery or a defective chip It will need to be reprogrammed if this happens This can be done by a skilled mechanic or at a Citroen dealership If the problem is severe youll need to have it replaced Its a simple and inexpensive fix But you must take action quickly The longer you put off fixing the problem the worse it becomes If the problem isnt addressed it could be a risk for the passengers and yourself Receiver Module Issue If your key fob stops working it could be due to the receiver module having developed an issue This can be caused by various factors including water damage This can happen if drop your keys or wash them You can attempt to resolve the issue by removing and cleaning the chip using isopropyl alcohol or electronic cleaner This will keep the chip from becoming corroded You can reset the receiver module when you disconnect it from the battery and then wait 10 seconds Then reconnect the battery to the car and repeat the process If this doesnt resolve the issue visit a dealership to have it replaced Another reason why your key could be unable to function is due interference It can be caused by other transmitters using the same frequency or by objects inside your vehicle If youre not able to fix the problem you can go to a dealership to have your key fob reprogrammed The key fob contains a shortrange radio transmitterradiofrequency identification RFID chip and antenna which sends a distinct coded signal to the receiver module in your car If the signal isnt accurate the receiver will not recognize the car key and display a message that reads key not recognized This can be a frustrating issue especially when you attempt to start your vehicle Dead 12 volt battery It is possible that your key fob has been damaged if it ceases to function after changing batteries This is especially true in the event that the key fob was dropped or stepped on however it can also happen following maintenance on your vehicle that requires the removal and reinstallation of the panels When the panels are removed wires are exposed If your fob was damaged it might need to be replaced entirely Another possibility is that the fob is receiving interference from other devices or locations This can cause RF signals to become less effective and hinder the car from recognizing the remote If this happens 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 power allowing the system to restart Before replacing the battery it is essential to ensure its of the correct size and type The circuit board that is inside the key fob can be damaged in the event that the replacement battery is too big or has a different voltage You should also clean any corrosive material from the chip in the fob before installing a new battery Using G28 of battery will ensure that it is properly sealed and shielded from moisture After the key fob has been reinstalled it should work normal You should be able to use the second key even if your car displays a message saying key not found It could be necessary to press the button a few times before it responds