Changing the battery in your Ford key fob can be a bit of a hassle, but it doesn’t have to be. If you are wondering if you need to reprogram your key fob after replacing the battery, then the answer is no. The new battery will automatically sync with your vehicle and you don’t need to do anything else. That being said, if for some reason this does not happen or if you are having difficulty getting into your car using the new battery then it may be necessary to reprogram your Ford key fob. To do this, all you need is access to an OBDII reader which can be easily purchased online at any auto parts store or electronics shop. Once connected, follow the instructions that come with the device and press down on both buttons simultaneously until they light up flashing green and red lights respectively meaning they have successfully been programmed correctly.