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Citroen C3 Key Fob TroubleshootingKey fobs from Citroen can cease to function due to a variety of causes. The most common reasons are worn buttons or poor contact with the battery, water damage, and receiver module issues. Examine the 12 volt batteries.If the key fob does not unlock your car, you could be experiencing deprogramming. This occurs when certain button actions send an indication to the computer in the car to delete the key from its list of access.Dead coin batteryIf your Citroen C3's key fob isn't working the first thing you should examine is whether the battery is dead. The batteries in the fobs are small, round coins that can be replaced within a few moments. You can find these in general stores, home improvement stores, and a few auto parts stores. Be sure to buy the correct type. Batteries for fobs are typically CR2025 or CR2032 However you should check the owner's manual for your vehicle to determine which type is required.Before you replace the battery, take off the button pad and rub it with cotton swabs or alcohol. These will help remove corrosion and clean the contacts which are usually colored gold. After the contacts have been cleaned, you are able to insert the new battery. Just be careful not to mix the two batteries because they have different voltages and sizes.Next, you will need to determine the voltage of the battery. You can get a precise reading using a multimeter that is calibrated to the battery's voltage range. If the battery is at a voltage that is higher or lower than its threshold, it has to be replaced. You can also start your vehicle using a spare key. However, this might not always work. If the issue continues, go to a CITROEN dealership with your V5 registration as well as personal identification documents. A CITROEN dealer can retrieve the code for the immobiliser on your vehicle and request a replacement battery.Water damageIf the key fob is under water, it could lose its signal to the car. It is recommended to get it out as soon as possible from the pool or puddle. After that, use the cotton swab along with isopropyl or electronic cleaner to dry the circuit board. If the key fob still isn't working, it could be time to buy an additional one.Signal interference is another frequent cause of Citroen remote control not working. This can occur when there is an electrical field close to the car or other transmitters that operate on the same frequency. The key fob will begin working once you leave the area of interference.The Citroen C3 key fob may stop working because of worn buttons problems with signal interference, receiver module issues as well as a dead 12-volt battery or a defective chip. You'll have to get it reset when this happens. This can be accomplished by a certified mechanic or a Citroen dealer. If the issue is serious, you may need to replace it. It's a relatively easy and affordable fix. But citroen remote key replacement must act quickly. The longer you take to address the issue, the worse it will become. It could be dangerous for passengers and you If the issue isn't resolved.Receiver Module IssueIf your key fob ceases functioning, it could be because the receiver module has developed an issue. Water damage is among the many reasons. This can happen when you lose your keys or wash them. You can attempt to solve the issue by removing and cleaning the chip with isopropyl alcohol or an electronic cleaner. This will stop the chip from getting 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 procedure. If this doesn't fix the problem, you can bring it to a dealer to be replaced.Interference can also cause your key to stop working. It can be caused by other transmitters that operate on the same frequency, or by objects inside your vehicle. If you are unable to solve the issue, take your key fob in to an authorized 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 won't recognize the key and will display a key not detected message. This can be a frustrating problem, especially when you're trying to start your vehicle.Dead 12 volt batteryIf your key fob stops working after a battery change, it may be damaged. This is most likely to happen when the key fob has been dropped or stepped on, but it can also happen following maintenance on your vehicle that requires removal and reinstallation of panels. Wires become exposed when panels are removed. If your fob is damaged, you may require replacement completely.Another possibility is that the fob receives interference from other devices or locations. This can make RF signals weaker and prevent the car from being able to recognize the remote. If this is the case, you can reset all on-board computers by disconnecting the battery that is 12 volts for approximately 15 minutes. This will remove any residual power, allowing the system to restart.It is crucial to determine the size and type of the battery before replacing it. If the battery you replace is too small or has an unsuitable voltage, it can damage the circuit board in the fob's key. Before installing a battery, you must clean the chip of the fob in order to eliminate any contaminants that could cause corrosion. Using the right battery will ensure that it is sealed and shielded from moisture. After the key fob has been replaced, it should work normally. In the majority of instances, you will be able to use the second key to start your car when it displays a message of "key is not detected." You may need to press the button several times before it responds.