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Citroen C3 Key Fob TroubleshootingCitroen c3 key fob can stop working due to many reasons. These include worn buttons poor battery contact, water damage and issues with the receiver module. You should also examine the 12 volt battery.Deprogramming could be the cause the key fob’s inability to unlocking your car. This happens when certain buttons send an email to the onboard computer asking that the key be removed from its list of keys.Dead coin batteryIf your C3’s keys fob isn’t working The first thing you need to examine is whether the battery is dead. The batteries that are in the fobs are small, round coins that can be replaced in just a few minutes. They are available in general stores, home improvements stores, and auto parts stores. Be sure to purchase the correct model, however. For fobs, batteries are typically CR2025 or CR2032 However you should check the owner’s manual of your vehicle to determine which kind is required.Take off the button pad and then use cotton swabs or alcohol to clean it. They will remove the corrosion and clean the contacts which are typically colored gold. After the contacts have been cleaned then you can put in the new battery. Be citroen berlingo key fob not to mix the two kinds as they differ in voltage, dimensions and shapes.Next, you will need to test the voltage of the battery. You can obtain a precise reading using a multimeter, which is set to the battery’s voltage range. If the battery has a voltage that is higher or lower than its threshold, it is required to 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 documents and personal identification documents. A CITROEN dealer can retrieve the code for your vehicle’s immobiliser and request the replacement battery.Water damageIf the key fob is submerged, it may lose its signal. It’s best to remove it as quickly as possible out of the pool or puddle. Once you do dry the circuit board in the best way you can using the help of a cotton swab, dipped into isopropyl ethanol or electronic cleaner. If it doesn’t work, it may be the time to replace your key fob.Signal interference is a common reason for Citroen remote controls not working. This may occur when there is a strong electrical field in the vicinity of the vehicle or from other transmitters on the same frequency. When you leave the interference area your key fob will begin working again.The Citroen C3 key fob may cease to function due to worn buttons signals, signal interference issues receiver module issues, a dead 12-volt battery or a malfunctioning chip. It will need to be reset in the event of this. This can be done by a skilled mechanic or at a Citroen dealership. If the issue is severe it is possible to replace it. It’s a simple and cost-effective fix, however it’s imperative to act swiftly. The longer you wait to address the issue, the worse it will become. If the issue isn’t fixed it could pose a danger for passengers and you.Receiver module issueIf your key fob is not working, the receiver module may have developed a fault. Water damage is one of the many reasons. It can happen when you drop 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 reset the receiver module when you disconnect it from the battery, and wait 10 seconds. Then, reconnect the battery and repeat the procedure. If this doesn’t fix the issue, bring it to a dealer to have it replaced.Another reason why your key could stop working is due to interference. It can be caused by other transmitters that operate on the same frequency, or by objects in your vehicle. If you’re unable to fix the issue, visit a dealer and 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 isn’t correct the receiver module won’t recognize the key and display a message that says “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 stops working after a change in batteries. This is more frequent in the event that your key fob has been dropped or stepped upon or stepped on, but it could also occur following a repair that requires the removal of panels and reinstallation. Wires are exposed when these panels are removed. If your fob has been damaged, it might require replacement.A fob that receives interference from other devices or locations is a second possibility. This can make the RF signals weaker and hinder the car from being able to recognize the remote. If this happens you can reset the on-board computers by disconnection of the battery at 12 volts for around 15 minutes. This will clear any residual power and allow the system to begin again.Before replacing the battery it is essential to ensure it is the correct size and type. The circuit board inside the fob’s key could be damaged when the replacement battery is too big or has an incompatible voltage. Before you install a battery you must clean the chip inside the fob to remove any contaminants that could cause corrosion. Using the correct type of battery can help ensure that it is properly sealed and protected from moisture. Once the key fob is been installed, it should work normally. In most instances, you will be able to use the second key to start your car even if it shows a message of “key not detected.” You may need to press the button several times before it responds.