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Citroen C3 Key Fob TroubleshootingCitroen c3 key fobs can not function for a variety of reasons. Some of them include worn buttons, poor contact with the battery, water damage, and receiver module problems. You should also examine the battery’s 12 volts.Deprogramming may be the cause of your key fob not unlocking your car. This occurs when certain button actions send an alert to the onboard computer to erase the key from its access list.Dead coin batteryIf the fob that you use to open the door on your Citroen C3 is no longer working, check first if the battery has failed. The batteries in the fobs are small round coins that can be easily replaced within a few moments. They are sold in general stores, home improvement stores and auto parts stores. Make sure you purchase the right type. Fobs typically require CR2025 or CR2032 however, you must check the owner’s manual to determine the type of battery that your car requires.Before you replace the battery, take off the button pad and rub it with cotton swabs or alcohol. This will remove any corrosion, and clean the contacts which typically have a gold color. Once the contacts are cleaned, it is now time to put in the new battery. Just be G28 not to mix the two types because they differ in their voltages and diameters.The next step is to test the battery’s voltage. You can obtain a precise reading with a multimeter that is calibrated to the battery’s voltage range. If the battery shows a value above or below its threshold, it needs to be replaced. You could also start your car with a spare keys. However, this may not always work. If the problem persists then visit an CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN Dealer can locate the code for your vehicle’s immobiliser and order a new battery.Water damageIf the key fob is submerged, it may 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. After that dry the circuit board as well as you can with an abrasive swab of cotton that’s been soaked in isopropyl alcohol or electronic cleaner. If it still doesn’t work It could be time to get a new key fob.Another reason that can be cited one of the main reasons for Citroen c3 remote control not working is signal interference. This could happen when there is an intense electrical field near the car or from other transmitters operating on the same frequency. The key fob is expected to begin to work again once you are out of the area of interference.The Citroen C3 key fob may cease to function due to worn buttons problems with signal interference, receiver module issues or a dead 12-volt battery, or a defective chip. You’ll need it reprogrammed if this happens. This can be accomplished by a qualified mechanic or a Citroen dealer. If the issue is severe, you may need to replace the device. This is a simple and inexpensive fix, but it’s important to act quickly. The longer you wait to resolve the issue, the more serious it will get. If the issue doesn’t get resolved, it can be dangerous for the passengers and yourself.Receiver Module IssueIf your key fob is not functioning the receiver module could have developed an issue. Water damage is one of the numerous reasons. This can happen if you drop your keys, or wash them. You can try to fix it by removing the chip and cleaning it with isopropyl, or electronic cleaner. This will help to avoid the chip from becoming damaged.You can also try to reset the receiver module by disconnecting it from the car battery and then waiting for 10 seconds. Then reconnect the battery to the vehicle and repeat the process. If this doesn’t fix the issue, you can go to a dealership and have it replaced.Interference can also 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 not able to fix the problem, you can visit a dealer to get 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 in order the receiver module won’t recognize the key and will display a key not detected message. This can be a frustrating problem, especially 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 changing batteries. This is particularly true when the key fob has been dropped or stepped upon, but it could also occur following repair on your vehicle that requires the removal and reinstallation of panels. Wires are exposed as panels are removed. If your fob was damaged, it may require replacement.Another possibility is that the remote receives interference from other devices or locations. This can make RF signals weaker and hinder the car’s recognition of the remote. If this is the case it is possible to reset all computer systems on board by disconnecting the battery at 12 volts for approximately 15 minutes. This will eliminate any remaining electricity, allowing the system to reboot.Before replacing the battery, it’s important to make sure it is the correct size and type. If the battery you replace isn’t big enough or has an incompatible voltage, it could harm the circuit board inside the fob’s key. Before you install a battery you must clean the chip of the fob to remove any corrosive substances. The correct battery type will ensure that the key fob is properly sealed and protected from moisture. Once the key fob has been reinstalled, it will function normally. In most instances, you will be able to use the second key to start your car even if it shows the message “key is not detected.” It might be necessary to press the button several times before it responds.