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Getting a Replacement Key Fob For Your Car Finding a replacement fob for your key could be costly, based on where you go to have it done. As opposed to the days where any locksmith could cut ridges in the metal to create keys, modern car keys require special programming. Certain automakers, including Audi, won't allow shops to program aftermarket fobs, says CR. That keeps would-be thieves from jotting down the specialized code to gain entry. Battery The battery in your keyfob isn't indestruc