How to Repair Fiat 500 Keys There are a myriad of reasons your Fiat 500 key fob may not function properly. The tiny "watch" inside the key FOB can fail. This is a 3.3-volt lithium CR2032 and you can purchase it for less than $3. A locksmith is the best option to contact if you require a replacement car key for an old Fiat model. United Locksmith offers this service, and has
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