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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can malfunction due to a variety of causes. Some of them include worn buttons, poor contact with the battery, water damage, and receiver module problems. You should also check the battery's 12 volts. Deprogramming could be the reason the key fob's not unlocking your car. This happens when certain button combinations send an electronic message to the computer requesting that the key be removed from its list of keys. Dead coin battery If your C3's keys fob isn't working The first thing you need to examine is whether the battery is dead. Fobs are small coin-shaped batteries which can be replaced in just a few minutes. They are sold in general stores, home improvement stores, and auto parts stores. Be sure to purchase the correct model. Fobs usually require CR2025 or CR2032 However, you should look through the owner's guide to determine the exact type of battery your car requires. Before replacing 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 usually colored gold. After the contacts have been cleaned then you can put in the new battery. Be careful not to mix the two kinds as they have different voltages, dimensions and shapes. Next, you will need to assess the voltage of the battery. You can get a reliable reading using a multimeter, which is set to the battery voltage range. If the battery has an amount that is above or below its threshold, it has to be replaced. You could also try to start your car using an additional key, however it may not work in all situations. If the issue continues, go to an CITROEN dealership with your V5 registration number and personal identification documents. A CITROEN dealer can obtain the code for your vehicle's immobiliser system and request the replacement battery. Water damage When the key fob goes underwater, it may lose its signal to the car. If this happens, it's a great idea to remove it of the puddle, pool, or washing machine as soon as you can. After that, dry out the circuit board as much as you can using the help of a cotton swab, dipped into isopropyl alcohol or an electronic cleaner. If it's still not working it could be the right time to purchase a new key fob. Another reason that is commonly cited the most common reason for Citroen remote control c3 not working is signal interference. This could happen when there is a strong electrical field near the car or from other transmitters operating on the same frequency. The key fob will begin working once you are out of the zone of interference. The Citroen C3 key fob could stop working because of worn buttons or signal interference issues, receiver module issues, a dead 12-volt battery or a malfunctioning chip. You'll need it reprogrammed when this happens. replacement key for citroen c1 can be done by a skilled mechanic or at an Citroen dealership. If the issue is significant it is possible to replace it. It's a fairly simple and inexpensive fix. But you must act quickly. The longer you put off taking action to correct the issue the more deteriorated it becomes. If the problem isn't addressed the issue could be a hazard for you and your passengers. Issue with the Receiver module If your key fob stops working, it might be due to the receiver module having developed a fault. This can be caused by various factors that include water damage. This could happen if you drop your keys or wash them. You can try to solve the problem by removing your chip and cleaning it with isopropyl and electronic cleaner. This will stop the chip from corroding. You can also try to reset the receiver module by disconnecting it from the car battery and waiting for 10 minutes. Then, reconnect the battery and repeat the process. If this doesn't fix the issue, you can take it to a retailer to be repaired. Interference can also cause your key to stop working. It could be caused by other transmitters that operate on the same frequency as your key fob, or even objects in your vehicle. If you are unable fix the issue, take your key fob to a 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 doesn't match, the receiver module won't recognize the key and display an error message that states the key is not detected. This could be a major issue especially when trying to start your car. Dead 12 volt battery If your key fob ceases working after an upgrade to a battery, it may be damaged. This is more likely when the key fob been thrown or stepped on However, it can occur after a service that requires the removal of panels and then reinstallation. Wires are exposed when these panels are removed. If your fob is damaged, you might require replacement completely. Another possibility is that the remote may be receiving interference from other devices or locations. This could cause the RF signals to weaken and stop the car from recognizing the remote. You can reset the onboard computer if this is the situation, by disconnecting the 12-volt battery for 15 minutes. This will clear any residual electricity and allow the system to start again. Before replacing the battery it's crucial to ensure it's the correct size and type. The circuit board that is inside the fob's key can become damaged when the battery you replace is too big or has an incompatible voltage. Before you install a battery you must clean the chip inside the fob to remove any corrosive substances. Using the right type of battery will ensure that it is sealed and protected from moisture. After the key fob has been installed, it will function normal. In most instances, you can use the second key to start your car when it displays the message “key is not detected.” It might be necessary to press the button a few times before it responds.