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If your C3 key fob suddenly stopped functioning it could be due to a faulty module. If the citroen relay key fob programming fob still functions it could be due to another issue, such as water damage or a dead battery.
citroen c1 key fob replacement aims to serve the mass market with its eC3. It has many features like virtual remote diagnosis and an app specifically designed for customer service.
Dead coin battery
If the key fob's unlock button isn't working, it could be a problem with the coin battery. The battery is expected to last between three and four years if used regularly but it is possible to die in a sudden manner. Fortunately, most car manufacturers have built-in fail-safes that ensure you are able to unlock and start your car even if the key fob is dead battery.
The battery inside a key fob is usually secured by metal clips that form the circuit. The battery may not be able to run if these clips are dirty or worn. Also, the battery needs to be the right size and type.