How to Find a Fiat 500 Spare Key Fiat's classic 500 has become an icon since its relaunch in 2007. The company is now launching an aggressive campaign to other powertrains, including a hybrid version. Replacing the battery in the key fob on a Fiat 500 is straightforward and inexpensive. It takes about 10 days for the key to be received from the Fiat main dealer.
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