How to Repair Fiat 500 Keys There are several reasons why your Fiat 500 key fob may stop working. One of the most common is that the tiny "watch" battery inside dies. This is an 3.3-volt lithium CR2032 and you can purchase it for less than $3. If you require the replacement key for an older Fiat model locksmith is the person to contact. United Locksmith offers this service
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