Fiat 500 Key Fob Replacement If your 500 keyfob stops working, you can use a different one to test if it will be detected by the car. If it does, then it could be a problem due to the battery or water damage to the original fob. First replace the battery. The "+" side should be facing downwards. <img width="388" src="https://g28carkeys.co.uk/wp-content/uploads/
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