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Car Key Fob Case Replacement Back in the day when keys were lost in cars, it meant a quick trip to the local hardware store or locksmith shop for an affordable replacement. Modern cars use high-tech keyfobs to control things like the power window, so replacing a key isn't cheap. Some fob covers can serve as shields to block signal hacking devices used by thieves to steal a vehicle. Battery If you have an ignition key that doesn't unlock or start your car, the most common reason is an inactive battery