Can you reprogram a remote from a different car?

Reprogramming a remote from a different car is generally not possible, as automotive key fobs are typically designed to work specifically with the electronic systems of their corresponding vehicles. Each key fob is programmed with a unique code that matches the car's security system. Some manufacturers may allow for limited compatibility, but in most cases, you would need a key fob specifically designed for that vehicle. If you need a new remote, it's best to obtain one from the car's manufacturer or a qualified locksmith.