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Citroen C3 Key Fob Troubleshooting Citroen key fobs might cease to function due to a number of reasons. This includes worn buttons, poor battery contact, water damage and receiver module issues. You should also examine the 12 volt battery. If the key fob can not unlock your car, you may be experiencing deprogramming. 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 battery If the fob that you use to open the door on your Citroen C3 is no longer functioning, first check if the battery has failed. The batteries that are in the fobs are tiny, round coins that can be easily replaced in a matter of minutes. They can be found in general stores, home improvements stores, and auto parts stores. Be sure to purchase the correct one, however. Fobs usually require CR2025 or CR2032, but you should consult your owner's manual to determine the exact type of battery your car requires. Take off the button pad and then use cotton swabs or alcohol to clean it. This will remove any corrosion, and clean the contacts, which typically have a gold color. After the contacts have been cleaned, it is now time to install the new battery. Just be careful not to mix the two types as they differ in their voltages and diameters. The next step is to test the battery's voltage. You can get an accurate reading using a multimeter which is set to the battery voltage range. If the battery shows the value that is either above or below its threshold, it is required to be replaced. You may also be able to start your car with a spare keys. However, this may not always work. If the problem persists go to an CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN dealer can retrieve the code for your vehicle's immobiliser and get a replacement battery. Water damage If the key fob is submerged, it could lose its signal. It is best to remove it as soon as you can from the puddle or pool. After this, use the cotton swab along with isopropyl or electronic cleaner to dry the circuit board. If it still doesn't work, it may be time to get a new key fob. Signal interference is a different reason for Citroen remote controls not working. It can happen when there is an intense electrical field that is close to the vehicle, or from other transmitters operating on the same frequency. Once you have left the interference area your key fob should be working normally again. The Citroen C3 key fob may cease to function due to worn buttons or signal interference issues, receiver module problems as well as a dead 12-volt battery or a malfunctioning chip. You'll need it replaced if this happens. This can be done by a skilled mechanic or at an Citroen dealership. If the issue is significant it may be necessary to replace the device. This is a relatively simple and inexpensive fix, but it's imperative to act swiftly. The longer you put off fixing the problem, the worse it becomes. It could be dangerous for you and your passengers when the issue is not addressed. Issue with the Receiver module If your key fob isn't working it could be because the receiver module might have developed a fault. This could be due to a number of things that include water damage. This could happen if you lose your keys, or wash them. You can fix the problem by taking off the chip and cleaning it with isopropyl or electronic cleaner. This will prevent the chip from getting corroded. You can also reset the receiver module by disconnecting it from the car battery and waiting for 10 seconds. Then reconnect the battery to the car and repeat the process. If this does not fix the issue, take it to a retailer to be replaced. Another reason why your key might not work is due to interference. It can be caused by other transmitters using the same frequency or objects inside your vehicle. If you're unable fix the problem, you can go to a dealer to have your key fob 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 in order 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 vehicle. Dead 12 volt battery It is possible that the key fob you have purchased has been damaged if it ceases to function after a change of batteries. This is especially common when the key fob is dropped or stepped on, however it also can occur after repair on your vehicle that requires removal and reinstallation of panels. Wires are exposed when the panels are removed. If your fob is damaged, you may need to replace it completely. Another possibility is that the remote receives interference from other devices or locations. This can cause RF signals to become weaker and block the car from being able to recognize 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 electricity and allow the system to begin from scratch. citroen car key repair is essential to verify the size and quality of the battery prior to replacing it. The circuit board in the fob's key could be damaged if the replacement battery is too large or has a different voltage. You should also remove any corrosive material from the chip in the fob before installing a new battery. Making sure you choose the right battery will ensure that it is sealed and protected from moisture. Once the key fob's been installed, it should work normally. In the majority of instances, you will be able to use the second key to start your vehicle even when it displays a message of “key is not detected.” It might be necessary to press the button multiple times before it responds.