Even if your key fob is too dead to unlock your vehicle, it should still be able to start it. Simply place the fob close to a contact patch that might be on the steering column, the centre console, or ...

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 ...