You can certainly go to a dealer but that's not your only option. Replacing a key fob might cost more than you think.For quick and cheap solutions check out more information on how to replace a key ...

Changing the battery in a current Mazda 3’s key fob is a simple job once you know the process. Start by locating the small button on the back of the key near the silver metal key ring lug, and ...

Check your battery type. Most fobs use small coin batteries (like CR2032), so confirm before you buy. Pry it open with care. Find the seam, pop it gently—no need to wrestle with it. Replace and click ...