How to Repair Fiat 500 Keys
There are several reasons why your Fiat 500 key fob may not function properly. One of the most frequent is the tiny "watch" battery that's inside it dies. This is an 3.3-volt lithium CR2032 and you can purchase it anywhere for less than $3.

If you require a replacement key for an older Fiat model, a locksmith is the one to contact. United Locksmith can provide this service and can provide the tools and spare parts needed.
Keys
Fiat keys might appear simple however inside is a chip that communicates with the immobiliser system of your car. If the chip isn't present, or not properly programmed to the immobiliser, your car will not be able to start. Car Keys Solutions can offer you dealer-grade equipment and technology to repair your Fiat key, even if the key is damaged or lost.
Having a spare key is the most efficient method to ensure your car is running in the event of a crisis or being locked out. It doesn't matter if you require a standard blank or a remote fob we can help. We only use the finest blanks and provide rapid turnaround time to ensure you get back on the road quickly.
Some people prefer to go to a Fiat Dealership if they require a new key, but we can provide a less expensive and quicker service. We can also come to you, saving you the cost of towing your vehicle to the dealer. This can also decrease the time it takes to wait, which is usually up to 10 days.
Remotes
The remote controls of Fiat vehicles are similar to keys, but they have an IR LED (infrared). This LED transmits an indication to the device that allows the car to open or stop when you press. The microprocessor inside the key transforms the signal into a code that is then sent to device.
This method is referred to as "keyless entry". The more recent your vehicle is and the more likely it will be to have a keyless entry feature. The more advanced your vehicle has, the more features will come with. This includes locking and unlocking your car at the a push of a button or opening the doors without touching the handle, and so much more.
The key fob comes with an integrated circuit chip that connects to the immobiliser system of the car. The system determines whether the key is in fact correct by checking a certain sequence in the transponder. If the chip is not present, or if it is not programmed to the correct immobiliser system the vehicle won't start.
A locksmith can replace the key fob in case it's damaged. They'll also have to program the new key to be synced with the immobiliser system of your car. You should be prepared to give your locksmith information regarding your vehicle when they call.
Keyless Entry
With a keyless entry feature on your Fiat 500 you can lock or unlock the vehicle by pressing one button. This technology is becoming increasingly popular in all kinds of vehicles, and adds convenience and security to the operation of your vehicle.
Check to see if your remote keyless entry system isn't working. The battery that powers the coin inside the fob could be depleted. If the battery is drained, replace it with a fresh one with the same voltage, size, and type as the original. It is also important to ensure that the battery contacts are clean and free of corrosion or dust.
The rubber seals on the key fob protect the chip from water. However exposure to prolonged soapy water or salty water may cause the chip to fail. If your key fob is exposed to water, you must remove the battery and allow it to dry completely before putting it back in. You can also clean the electronic chip using isopropyl and electronic cleaner.
Although some may think that keyless entry isn't as secure, this system is actually more secure than other systems because the code that unlocks your car is rolled up after every use. This means that even if hackers are able to intercept the signal, they won't be able to gain permanent access to your car.
fiat 124 spider key fob cover utilizes a crypto key transponder system. This means that the keys and transponders have to be precoded with a secret code generated by the Body Control Module (BCM) before being "programmed" into the BCM. This is why a blank unwritten key is not able to be programmed, because the BCM has to read & write the secret key to the transponder and then lock it. This process is referred to as the cloning.
These are brand new replacement outer case OE SIP22 transponder keys for your fiat 500. They have a chip inside that opens the doors and also starts the car. Locksmiths must cut them to fit in your ignition.