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Citroen C3 Key Fob TroubleshootingKey fobs from Citroen can stop working due to a number of reasons. Some of these include worn buttons or poor contact with the battery, water damage and receiver module issues. You should also check the battery’s 12 volts.If the key fob does not unlock your car, you might be experiencing deprogramming. This happens when certain key sequences send an indication to the computer in the car to delete the key from its list of access.Dead coin batteryIf the key fob on your Citroen C3 is no longer working, check first if the battery has gone out. Fobs have small coin-shaped batteries which can be replaced within a few minutes. These can be found in general stores, home improvements stores, and auto parts stores. Be sure to purchase the right type. For fobs, batteries are typically CR2025 or CR2032, however you should check the owner’s manual for your vehicle to determine what type is required.Remove the button pad, and then use cotton swabs or alcohol to clean it. These will help remove corrosion and clean the contacts which are usually colored gold. Once the contacts have been cleaned, you can insert the new battery. Be careful not to mix the two types because they have different diameters and voltages.Next, you will need to assess the voltage of the battery. You can get a precise reading with a multimeter that is calibrated to the battery’s voltage range. If the battery’s voltage is in the middle or above the threshold, it should be replaced. You can also start your car with a spare keys. However, this might not always work. If the issue persists, visit a CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN dealer will be able to retrieve the code for the immobiliser on your vehicle and purchase a replacement battery.Water damageIf the key fob is submerged, it could lose its signal. If this occurs, it’s a good idea to remove it from the pool, puddle or washing machine as quickly as you can. Once you do dry the circuit board in the best way you can with an abrasive swab of cotton that’s been soaked in isopropyl alcohol or electronic cleaner. If it doesn’t work then it’s the right time to purchase a new key fob.Signal interference is another frequent reason for Citroen remote controls not working. It can happen when there is an electrical field in the vicinity of the vehicle or other transmitters that operate on the same frequency. Once you have left the interference area, your key fob will restart working.Lastly, the Citroen C3 key fob might stop working due to worn buttons signals, signal interference, receiver module issues and a dead 12 volt battery, or a malfunctioning electronic chip. It will need to be reset in the event of this. This can be accomplished by a qualified mechanic or at an Citroen dealership. If the issue is serious it’s time to have it replaced. It’s a simple and inexpensive fix, but it’s important to act quickly. The longer you put off fixing the issue, the more serious it gets. If the issue isn’t resolved the issue could be a hazard for you and your passengers.Receiver module issueIf your key fob is not working, the receiver module may have developed a fault. Water damage is among the numerous causes. This can happen when you drop your keys, or wash them. You can try to resolve the issue by removing and cleaning the chip with isopropyl ethanol or electronic cleaner. This will keep the chip from corrosion.You can reset the receiver module if you disconnect it from the battery, and wait 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 cause your key to stop working. It could be caused by other transmitters operating on the same frequency, or by objects in your vehicle. If you’re unable to solve the issue, you can bring your key fob to an authorized dealer to have it 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 is not accurate, the receiver will not recognize the car key and display a message saying “key not recognized”. This can be a gruelling issue, particularly when trying to start your car.Dead 12 volt batteryIt is possible that your key fob may have been damaged if it stops working after the change of batteries. This is more common when your key fob has been thrown or stepped on However, it can occur following a repair that requires the removal of panels and reinstallation. When the panels are removed, the wires are exposed. If your fob was damaged, it may require replacement completely.TheKeyLab that is receiving interference from other devices and locations is another possibility. This can make RF signals less effective and hinder 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 erase any remaining electrical charge and let the system start from scratch.Before replacing the battery, it is important to ensure it’s the correct type and size. The circuit board inside the fob’s key can become damaged if the replacement battery is too large or has an incompatible voltage. Before you install a battery you should clean the chip of the fob to eliminate any corrosive substances. Using the right type of battery will ensure that it is sealed and shielded from moisture. Once the key fob is reinstalled, it should work normal. It is usually possible to use the second key the car displays a message that says “key is not recognized.” You may need to press the button several times before it responds.