Fiat 500 Key Fob Replacement
If your 500 keyfob ceases working, you can use a different one to test if it will be detected by the car. If it does, then the issue is most likely to be with the original fob's battery or water damage.

Replace the battery first. The "+" side should be facing down.
Dead Battery
The majority of the time, when a fob's not working, it's just because the battery is dying. This is a simple solve and most fobs warn you when the battery is dying. You can find the instructions for the majority of car key fobs on YouTube or in the owner's manual. You can also change it by taking it to the locksmith or dealer who sold it to you.
Sometimes, a fob will stop working and there may be a problem with the circuit board in the internal circuit. It's rare however it can happen. The internal chip may be damaged in the event you drop the fob over something hard. It can be a problem if you have an aftermarket fob, and the key doesn't work. In this instance you'll have to visit a locksmith or dealer and have it reconfigured to work with your 500.
One 2012 FIAT 500 Flip Key Remote - Look-alike Ilco brand with trunk, lock and lock buttons. It is a replacement keyless entry remote (will require cutting & programmed by locksmith)
Chips Damaged
A key fob with the fiat 500 number is a wireless device that provides an indication for the car to start once you press the button. It has a microchip which contains information about the code that is needed to communicate with the car. If the chip is damaged, it won't transmit the correct code and the car won't start. It's possible to repair this kind of damage and a locksmith will help. United Locksmith can complete this service on both classic and modern models, so do not hesitate to contact us.
A locksmith can program an entirely new key fob. It's less expensive to do this than go to the dealer, and it is just as effective. Locksmiths will require specific details from you, like the year your car was built and the name of its model.
If you are not sure how to fix this issue, try rub the chip with the help of a US dollar bill. The copper in the bill is abrasive enough to get rid of dirt and oxidation however, it won't cause harm to the microchip. The chip might not be repaired in the event of physical damage. This can happen when you lose it, drive it over by accident with your vehicle, or some other kind of physical strain.
Water Damage
If you've accidentally dropped your keys in the pool, put them in your pocket while swimming at the beach, or splashed them with water on a rainy day you can be sure that your fob will suffer from water damage. Even if there's only the smallest amount of water on the key, it can cause major problems for its electronic components.
fiat panda key fob replacement is that it is possible to solve this issue by removing the key fob and using an old towel to scrub it of any remaining dirt or water. After the fob is dry and clean, you can replace the battery and it will begin working normally.
You can also take your fob to a local locksmith or auto shop to have it professionally cleaned and programmed. These experts are able to utilize special equipment to make sure that the key fob works with your car's computer.
If your Fiat 500's main fob isn't working, it can be stressful and disorienting. You may be tempted to visit a dealer to replace your key fob, but this can be expensive and unaffordable. Locksmiths can replace your key fob, without having to visit an establishment. For this reason, they are a much better option than a dealership.
Pairing Issues
When you drop your key fob, or it stops working and nothing else seems to be problem there could be a chip that has gone off the rails. It could be due to water damage or a dead battery. it could be that it needs reprogramming.
Most of the time, this can be done by following the steps in the owner's manual. However, it's a good idea to have an automotive locksmith take care of this if you're having trouble or the instructions in your manual don't work for you. This will ensure that the chip is not damaged, and it's the most affordable alternative.
Another problem with some 500 owners is that the key fob won't secure the car. This could be a problem if you want to fill up at a gas station. Some owners have 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 an technical bulletin (TSB).
If you're having issues with your Fiat vehicle, a reputable locksmith can help. They can duplicate your current key or make you a brand new one that locks and starts the car. They can accomplish this without having to see your old key and are usually more affordable than purchasing it from the dealership.