How to Repair Fiat 500 Keys There are several reasons your Fiat 500 key FOB may not function properly. One of the most common is when the small "watch" battery inside it dies. This is an 3.3 volt lithium, CR2032, which you can buy just about anywhere for under $3. If you require a replacement key for an older Fiat model locksmith is the one to call. United Locksmith offers
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