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Citroen C3 Key Fob TroubleshootingCitroen key fobs may stop working due to a number of causes. There are a variety of reasons, including worn buttons that are not in contact with the battery, water damage, and receiver module issues. Examine the 12 volt batteries.Deprogramming is a possible cause of your key fob not unlocking your car. This occurs when certain button combinations send an email to the onboard computer, asking that the key be removed from its list of keys.Dead coin batteryIf the fob that you use to open the door on your Citroen C3 is no longer functioning, first check if the battery is dead. Fobs are small, coin-shaped batteries that can be replaced in a few minutes. These can be found in general stores, home improvements stores, and auto parts stores. Be sure to purchase the correct one, however. The majority of fobs require CR2025 or CR2032 However, you should refer to the owner's manual of your vehicle to determine the exact kind of battery your vehicle requires.Before replacing the battery, take off the button pad and rub it with alcohol and cotton swabs. This will help to remove corrosion and clean the contacts, which are typically colored gold. Once the contacts are cleaned, you are able to put in the new battery. Be careful not to mix the two types as they differ in voltage, sizes and diameters.Next, citroen spare key will need to check the voltage of the battery. A multimeter that is set to the battery's voltage range should provide you with a precise reading. If the battery is at the value that is either above or below its threshold, it needs to be replaced. You could also try starting your car with a spare key, but this may not work in all cases. If the problem persists you should visit a 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 can lose its signal. It is advised to remove it as quickly as you can out of the pool or puddle. Once you have done that dry the circuit board as well as you can using an abrasive swab of cotton that's been soaked in isopropyl ethanol or electronic cleaner. If it's still not working It could be time to get a new key fob.Signal interference is a different reason for Citroen remote control not working. It can happen when there is an electrical signal near the car or other transmitters using the same frequency. The key fob should begin working once you are out of the zone of interference.The Citroen C3 key fob may cease to function due to worn buttons or signal interference issues, receiver module problems or a dead battery or a malfunctioning chip. You'll need to have it changed to a new program when this happens. This can be done by a trained mechanic or at a Citroen dealership. If the issue is severe then you'll have to get it replaced. This is a fairly easy and inexpensive fix, but it's essential to act quickly. The longer you put off taking action to address the issue, the more severe it will be. It could be dangerous for you and your passengers if the problem is not solved.Receiver Module IssueIf your key fob stops working, it could be because the receiver module has developed an issue. This could be due to various factors such as water damage. This could happen if you drop your keys, or wash them. You can fix it by removing the chip and cleaning it with isopropyl or an electronic cleaner. This will keep the chip from getting damaged.You could also try to reset the receiver module by disconnecting it from the car battery and waiting for 10 minutes. Then reconnect the battery to the vehicle and repeat the process. If this does not resolve the problem, you can take it to a retailer for replacement.Interference can cause your key to stop working. This can be caused either by other transmitters on the same frequency or by objects in your vehicle. If you're unable to solve the issue, you can take your key fob to an authorized dealer to have it 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 accurate the receiver won't recognize the car key and display a message stating "key not detected". This can be a frustrating problem particularly when trying to start your vehicle.Dead 12 volt batteryIf your key fob ceases working after an upgrade to a battery the device could be damaged. This is more common if your key fob has been dropped or stepped over or stepped on, but it could also happen after a service that requires the removal of panels and then reinstallation. Wires are exposed when the panels are removed. If your fob is damaged, it may need to be replaced entirely.Another possibility is that the fob may be receiving interference from other devices or places. This could cause RF signals to weaken, preventing the car from acknowledging the remote. You can reset the on-board computer if this is the situation by disconnecting the 12-volt battery for 15 minutes. This will clear any residual electrical charge and allow the system to restart over.Before replacing the battery it is essential to ensure it's of the correct type and size. The circuit board on the fob's key can become damaged when the battery you replace is too big or has an unrelated voltage. You should also clean any corrosive substances from the chip inside the fob before installing the new battery. The proper type of battery will ensure that the key fob is properly sealed and protected from moisture. After the key fob has been put back in place, it should function normal. It is possible to use the second key when your car displays a message that says "key not found." It is possible to press the button several times before it responds.