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Car Key Fob Replacements Most of the time, your key fob doesn't need to be replaced--it just requires to be programmed. This process varies between cars however, it generally involves pressing fob buttons to enter programming mode, and then transmitting the digital identification code to your car's computer. Check your owner's manual, warranty, or policy on car insurance to determine what options are available to you. Consider a locksmith who has a good reputation and responsive cust