What the Security Light Means When Your Remote Car Key Stops Working

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When your remote car key stops working, a blinking security light on the dashboard usually means the car's computer isn't recognizing the key's signal. This could be from a dead battery inside the fob, a lost synchronization between the key and the car, or even interference. Sometimes just standing closer or replacing the fob's battery brings it back to life. If not, you might need to manually unlock the door and then hold the key near the start button to re-sync it.