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How to Fix a Key Fob That isn't Working If your key fob isn't working, a few easy steps can fix it. The first step is to make sure that it's not your backup remote. If your backup remote is unable to lock and unlock the doors of your car, it is likely that the main remote isn't working. Most problems with car remote keys are caused by circuitry or battery issues. Battery The battery inside the key fob may get worn out over the course of time. It is relatively easy to change out the battery, howeve