If a battery powered key fob is opened does it need to be reprogrammed operate again?

Not necessarily. While some key fobs may need to be reprogrammed after the battery is replaced, many modern key fobs do not. The need for reprogramming typically depends on the specific vehicle and key fob model.

In most cases, replacing the battery in a key fob is a simple process that does not require any additional programming. However, some vehicles may require the key fob to be reprogrammed after the battery has been replaced. This is usually the case for key fobs that use a rolling code system, which is a security feature that prevents the key fob from being cloned or copied.

If you are unsure whether or not your key fob needs to be reprogrammed after the battery is replaced, it is best to consult your vehicle's owner's manual or contact a qualified automotive technician for assistance.