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Citroen C3 Key Fob TroubleshootingCitroen c3 key fob can stop working for various reasons. They can be due to worn buttons, poor contact between the battery and the water and issues with the receiver module. You should also check the 12 volt battery.If the key fob does not unlock your car, it could be experiencing deprogramming. This happens when certain buttons send an electronic message to the computer, asking that the key be removed from its list of keys.Dead coin batteryIf your Citroen's C3's key fob no longer works the first thing you should check is if the battery is dead. The batteries in the fobs are small round coins that can be easily replaced in just a few minutes. They are available in general stores, home improvement stores and auto parts stores. Make sure you buy the correct battery, however. The batteries for fobs are usually CR2025 or CR2032, however you should check the owner's manual for your vehicle to determine which type is required.Before replacing the battery, take off the button pad and rub it with cotton swabs or alcohol. This will help to remove corrosion and clean the contacts which are typically colored gold. After the contacts have been cleaned, you are able to put in the new battery. Be cautious not to mix the two types since they differ in voltage, diameters and shapes.The next step is to check the battery's voltage. A multimeter set to the battery's voltage range should provide you with a precise reading. If the battery's current value is above or below threshold, then it needs to be replaced. You may also try getting your car started using an additional key, however this may not be effective in all cases. If the issue continues you should visit an CITROEN dealer with your V5 registration form and personal identifi cation documents. A CITROEN Dealer can locate the code of your vehicle's immobiliser and can order new batteries.thekeylab.co.ukWhen the key fob goes underwater it may lose its signal to the car. If this happens, it's a great idea to remove it from the pool, puddle, or washing machine as quickly as possible. After this, use the cotton swab along with isopropyl or electronic cleaner to dry the circuit board. If the key fob isn't working, it may be time to buy an entirely new one.Another common reason the most common reason for Citroen c3 remote control not working is signal interference. This can occur when there is an electrical field close to the vehicle or other transmitters that operate on the same frequency. The key fob should begin to work again once you leave the zone of interference.Finally, the Citroen C3 key fob might cease to function due to worn buttons or signal interference, receiver module issues or a dead 12 volt battery, or a malfunctioning electronic chip. If this happens, then you'll need to get it reprogrammed by an expert. This can be accomplished by a qualified mechanic or at a Citroen dealership. If the issue is serious, you may need to replace it. This is a simple and cost-effective fix, however it's essential to act quickly. The longer you take to correct the issue the more serious it will get. If the issue doesn't get resolved it could pose a danger for passengers and you.Receiver module issueIf your key fob isn't functioning it could be because the receiver module might have developed an issue. This could be due to a number of things like water damage. It can happen when you lose your keys, or wash them. It is possible to fix the problem by taking off the chip and cleaning it with isopropyl or an electronic cleaner. This will help to avoid the chip from becoming damaged.You can also reset the receiver module when you disconnect it from the battery for 10 seconds. Then, reconnect the battery and repeat the procedure. If this fails to fix the issue, go to a dealer to have it replaced.Interference can also cause your key to stop working. This could be caused by other transmitters that operate on the same frequency as your key fob or even objects in your vehicle. If you're not able to solve the issue, take your key fob in to a dealer and have it reset.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 right the receiver module will not recognize the key and display a message that says "Key Not Detected. This can be a frustrating issue especially when you attempt to start your vehicle.Dead 12 volt batteryIt is possible that your key fob has been damaged if it stops working after a change of batteries. This is most likely to happen if the key fob was dropped or stepped on. However, it can also happen following servicing on your car that requires the removal and reinstallation of the panels. Wires are exposed when the panels are removed. If your fob is damaged, you might require a complete replacement.Another possibility is that the fob is getting interference from other devices or places. This can make RF signals less effective and hinder the car from recognizing the remote. You can reset the onboard computer in this situation, by disconnecting the 12-volt battery for 15 minutes. This will take away any remaining electricity, allowing the system to restart.It is crucial to determine the size and type of the battery before replacing it. The circuit board inside the fob's key could be damaged when the replacement battery is too big or has an unrelated voltage. Before you install a battery you should clean the chip of the fob to remove any corrosive substances. Using the right battery can help ensure that it is sealed and protected from moisture. Once the key fob is put back in place, it should function normal. You can usually use the second key if your car displays a message stating "key is not recognized." It could be necessary to press the button multiple times before it responds.