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Citroen C3 Key Fob TroubleshootingKey fobs from Citroen can malfunction due to a number of reasons. They can be due to worn buttons, poor contact between the battery and the water, and receiver module issues. Check the 12 volt batteries.If the key fob can not unlock your car, you could be experiencing deprogramming. This happens when certain button sequences send a signal to the onboard computer to erase the key from its list of access.Dead coin batteryIf the key fob on your Citroen C3 is no longer functioning, first check if the battery has failed. The batteries in the fobs are tiny, round coins that can be replaced within a few moments. They are sold in general stores, home improvement stores and auto parts stores. Be sure to purchase the correct one, however. The majority of fobs require CR2025 or CR2032 However, you should consult your owner's manual to determine the exact kind of battery your vehicle requires.Before replacing the battery, take off the button pad and rub it using cotton swabs and alcohol. This will help remove corrosion and clean the contacts, which are usually colored gold. Once the contacts have been cleaned and sanitized, you can then insert the new battery. Be careful not to mix the two types since they have different voltages, sizes and diameters.The next step is to check the battery's voltage. A multimeter set to the battery's voltage range should provide a precise reading. If the battery's value is above or below threshold, it should be replaced. You may also be able to start your car with a spare key. However, this may not always work. If the issue continues then visit a CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN Dealer can obtain the code for your vehicle's immobiliser and can order a new battery.Water damageIf the key fob is submerged it could lose its signal. It is advised to remove it as fast as possible from the pool or puddle. After that, dry out the circuit board as much as you can using an abrasive swab of cotton that's been soaked in isopropyl alcohol or electronic cleaner. If the key fob still isn't working, it could be time to buy an entirely new one.Another common reason one of the main reasons for Citroen remote control c3 not working is signal interference. This can occur when there is a strong electrical field that is close to the vehicle or from other transmitters on the same frequency. When you leave the interference area the key fob will restart working.The Citroen C3 key fob may be inoperable due to worn buttons problems with signal interference, receiver module issues as well as a dead 12-volt battery or a defective chip. If this happens, then you'll require it to be changed by a certified expert. This can be accomplished by a qualified mechanic or an Citroen dealer. If the issue is serious you may have to replace the device. It's an easy and inexpensive fix. But you have to act quickly. The longer you delay to address the issue, the more serious it will get. If the problem isn't addressed it could pose a danger for passengers and you.Receiver Module IssueIf your key fob is not functioning, the receiver module may have developed an issue. Water damage is among the many reasons. This could happen if you drop your keys, or wash them. You can attempt to fix the issue by taking off and cleaning the chip with isopropyl ethanol or electronic cleaner. This will 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 and repeat the process. If this doesn't solve the issue, you can visit a dealership to get it replaced.Another reason why your key could stop working is due interference. This could be caused by other transmitters using the same frequency, or by objects in your vehicle. If you are unable to resolve the issue, you can go to a dealer to have your key fob 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 is not accurate it will not recognize the car key and display a message stating "key not detected". This can be a frustrating issue, particularly when trying to start your car.Dead 12 volt batteryIt is possible that your key fob may have been damaged if it ceases to function after a change in batteries. This is especially common when the key fob has been dropped or stepped on. However, it can also happen following service on your car that requires removal and reinstallation of the panels. Wires are exposed as panels are removed. If your fob was damaged, it may need to be replaced entirely.A remote that is receiving interference from other devices and locations is also a possibility. This can make RF signals weaker and block the car's recognition of the remote. You can reset the on-board computer in this scenario by disconnecting your 12-volt battery for 15 minutes. This will erase any remaining electrical charge and allow the system to start from scratch.It is crucial to determine the size and quality of the battery before replacing it. The circuit board on the fob's circuit board could be damaged in the event that the replacement battery is too big or has an incompatible voltage. Also, you should clean any corrosive substances from the chip in the fob before installing the new battery. The right battery type can ensure that the key fob is sealed and protected against moisture. After the key fob has been installed, it should work normally. citroen c1 key fob replacement is usually possible to use the second key even in the event that your vehicle displays a message that says "key is not recognized." You may have to press the button several times before it responds.