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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can not function due to a number of causes. replacement key for citroen c1 include worn buttons, poor contact between the battery and the water, and receiver module issues. You should also examine the 12 volt battery. Deprogramming is a possible cause the key fob's inability to unlocking your car. This happens when certain buttons send an email to the onboard computer requesting that the key be removed from its list of keys. Dead coin battery If your Citroen's C3's key fob isn't working The first thing you need to look for is if the battery is dead. The batteries in the fobs are small round coins that can be changed in a matter of seconds. They can be found in general stores, home improvement stores and auto parts stores. Be sure to buy the correct kind. For fobs, batteries are typically CR2025 or CR2032 However you should check the owner's manual for your vehicle to determine which kind of battery is needed. Before you replace the battery, remove the button pad and rub it with cotton swabs and alcohol. This will help remove corrosion and clean the contacts, which are typically colored gold. Once the contacts have been cleaned, you are able to install the new battery. Be cautious not to mix the two batteries as they differ in voltage, sizes and diameters. Next, you will need to check the voltage of the battery. A multimeter that is set to the battery's voltage range will give you an accurate reading. If the battery's current value is in the middle or above the threshold, then it must be replaced. Try starting your car with a spare key, but this might not be successful in all instances. If the issue persists, go to an CITROEN dealership with your V5 registration and identity documents. A CITROEN dealer can obtain the code for the immobiliser on your vehicle and request a replacement battery. Water damage If the key fob is submerged, it can lose its signal. It is advised to remove it as soon as possible from the pool or puddle. Once you have done that dry the circuit board as much as you can using a cotton swab that has been dipped in isopropyl alcohol or electronic cleaner. If it's still not working then it's time to get a new key fob. Another common reason for Citroen c3 remote control not working is signal interference. It can happen when there is a strong electrical field that is close to the vehicle or from other transmitters operating on the same frequency. The key fob should begin to work again once you are out of the zone of interference. The Citroen C3 key fob could not function because of worn buttons, signal interference issues, receiver module problems or a dead battery or a malfunctioning chip. You'll need to have it reset if this happens. This can be accomplished by a certified mechanic or a Citroen dealer. If the issue is severe the vehicle will need to be it replaced. It's a simple and affordable fix. But you should get it done quickly. The longer you put off fixing the issue, the worse it gets. If the issue isn't resolved it could pose a danger for you and your passengers. Issue with the Receiver module If your key fob ceases working, it might be because the receiver module has developed a fault. It could be caused by various factors that include water damage. It can happen when you drop your keys, or wash them. You can try to repair the issue by removing the chip and cleaning it with isopropyl or electronic cleaner. This will stop the chip from corrosion. You can reset the receiver module when you disconnect it from the battery and then wait 10 seconds. Then, reconnect the battery and repeat the process. If this does not resolve the issue, take it to a dealership to be repaired. Another reason why your key might be unable to function is due interference. This could be caused by other transmitters using the same frequency as your key fob, or by objects inside your vehicle. If you're not able to solve the issue, you can bring your key fob to an authorized dealer and have it changed to a different frequency. 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 it will not recognize the car key and display a message that reads “key not recognized”. This can be a frustrating issue particularly when trying to start your car. Dead 12 volt battery If your key fob ceases working after an upgrade to a battery it could be damaged. This is especially common if the key fob was dropped or stepped on. However, it can also happen after servicing on your car that requires removal and reinstallation of panels. Wires are exposed as panels are removed. If your fob is damaged, it may require replacement completely. Another possibility is that the remote is receiving interference from other devices or locations. This could make RF signals weaker and block the car from recognizing the remote. If this happens, you can reset all computer systems on board by disconnecting the battery at 12 volts for around 15 minutes. This will eliminate any remaining electrical charge and allow the system to start over. It is important to check the size and quality of the battery before replacing it. The circuit board on the fob's circuit board could be damaged if the replacement battery is too large or has an unrelated voltage. Before installing a battery you should clean the chip inside the fob to get rid of any corrosive substances. Using the correct type of battery can help ensure that it is sealed and shielded from moisture. Once the key fob is put back in place, it should function normal. In the majority of instances, you can use the second key to start your vehicle even if it shows a message saying “key not recognized.” It is possible to press the button a few times before it responds.