fiat stilo key Panda Key Fob Replacement fiat Key Programmer Panda key fobs contain a transponder chip that sends signals to your car to open the doors or start the engine. The fob might stop working due to a variety of reasons. The most frequent cause of key fob failure is a dead coin battery. Other causes are water damage, a faulty module, and interference signals. Dead Coin Battery Replace the battery if your key fob has failed. Use a button cell with the same voltage, size and specifications as the previous one. If the key fob was exposed to water, such as a splash of rain or salt water on the beach, it will have to be cleaned before it is able to be used again. The best method is to use a paper towel that has been soaked in isopropyl, or electronic cleaner. If the fiat punto key fob replacement fob is not working despite not being exposed to water, it could be due a malfunction in the receiver module or in the internal electronic chip. Reprogramming the keyfob by using an OBDII scan could help in these cases.