Fiat 500 Key Fob Replacement
If your 500 keyfob ceases functioning, try another to see if it is able to be detected by your car. If it does, the problem is most likely due to the original fob's battery, or water damage.
Replace the battery first. Make sure that the new # CR2032 coin battery is correctly inserted with the "+" side facing down inside the fob.

www.g28carkeys.co.uk is often the reason for the fob not functioning. It's easy to solve and most fobs warn you when the battery is dying. You can find the correct procedure on YouTube for almost every key fob in your car or in the owner's manual. You can also bring it to a local locksmith or to the dealer who gave it to you to replace it.
Sometimes a fob stops working due to a fault on the internal circuit board. It is rare however, it can happen. The internal chip can be damaged if you drop the fob over something hard. This is also the case if you use an aftermarket key and the fob does not work. In this case it is imperative to visit a dealer or locksmith to have the key reset to work with your 500.
One 2012 FIAT 500 Flip Key Remote - resembles Ilco brand with lock, unlock and trunk buttons. New replacement keyless entry remote (will need to be cut & programmed by a locksmith)
Damaged Chip
Fiat 500 key fobs are wireless devices that send an electronic signal to the car whenever you press the button. It is equipped with a microchip that contains details about the code required to communicate with your car. If the chip is damaged, it won't send the correct code, and the car won't start. It's possible to repair this kind of damage and a locksmith will assist. United Locksmith is capable of offering this service to classic models as well as newer models, so don't be scared to contact them.
A locksmith can program an entirely new key fob. This is less expensive than visiting a dealer and it works just as well. You'll need certain information to the locksmith, like the year your vehicle was manufactured and the model.
Rub the chip with an old dollar bill if you're not sure what to do. The copper in the bill is abrasive and will get rid of dirt and oxidation. However, it will not harm the microchip. The chip may not be repaired in the event of physical damage. This could happen if you drop it or hit it by your vehicle.
Water Damage
Water damage is likely to happen on your device, whether you dropped them in the pool accidentally, left them in a pocket while swimming, or splashed them with water during a rainy afternoon. Even if there's only a small amount of water on the key, it can cause serious problems with its electronic components.
It is possible to fix this issue by removing the fob and cleaning it using a paper towel. After the fob is dry it is possible to replace its battery. It will then begin working normally.
You can take it to an auto repair shop or locksmith to have it professionally programmed and cleaned. They will be able to use special equipment to make sure that the key fob works with your car's computer system.
When your Fiat 500's key fob isn't working, it can be a stressful and frustrating. It's expensive and difficult to transport your key fob to the dealer. Locksmiths can take care of every aspect of your car's key fob replacement without the need for a dealership visit. They are a better option than a dealer, as they can take care of all aspects of the replacement of your car's key fob without the need for a dealer visit.
Pairing Issues
When you drop your key fob, or it stops working but there is nothing problem, it could be the chip that has gone awry. This could be due water damage or a dead battery, or it could just be that you need to reprogramme it.
This can often be done by simply following the directions in your owner's manual. However it's recommended to hire an automotive locksmith assist you if you're experiencing difficulties or the steps in the manual don't work for you. This will ensure that the chip is not damaged, and it's the most affordable option.
Some 500 owners have also reported that their key fobs will not lock their cars. This could be an issue if you're driving to the gas station to refill. Some owners have even reported their 500's locking mechanism breaking and needing to replace the entire intermediate shaft of the steering. Fiat has actually mentioned this issue in a technical bulletin (TSB).
If you're having problems with your Fiat car, an experienced locksmith can assist. They'll duplicate your existing key or design a new one that will lock and open the car. They can do this without seeing your old key, and it's typically cheaper than purchasing one from a dealer.