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How to Repair Car Key Fobs Although we put them through numerous times keys are not impervious to destruction. They can actually break down in various ways. While the most common issue is a dead battery however, other issues could be more grave. Fortunately, many of these can be fixed by making a quick DIY fix at home. Dead Battery A dead battery is the main cause of the key fob not functioning. Fob batteries drain quickly, particularly if they're exposed to extreme temperatures, humidity, or water. It is a good