Generally speaking, batteries plus key fob programming cost anywhere between about $55 and $400.

Transponder keys – Expect to pay anywhere from $100 to $250 for a transponder key replacement. The immobilizer chip in the key will also need to be programmed. Smart keys – Replacement costs for smart keys can range from $200 to $500 or more. The advanced technology and keyless features contribute to the higher price.

Sometimes people mix up keyfobs and remote keys, but there's a significant difference between these two types of car keys. A remote key is a device you use not only to unlock or lock your car by pushing a button but also to open the door manually. That means that a remote key includes the actual key.

As car technology and car safety features have evolved, so have car keys. No longer just a piece of metal, they're sophisticated electronic devises with a battery, transponder chip and printed circuit board. They're expensive to replace due to the tools and licensing required.