What's the mazda 3 spark plug socket size?

The socket size for the spark plugs on a Mazda3 will be 9/16". This is the standard spark plug socket size that Mazda uses on the majority of it's vehicles. The spark plugs for this vehicle will need to be replaced every 60,000 to 80,000 miles. You will see a maintenance required light pop up on Your dashboard when it is time to have it done. A single new spark plug will cost between $5 and $10. If You need a full set it will be between $15 and $25. If You want to take it in to a shop to have them change it out it will cost between $140 and $220.