See also:

How the Air Bags Work
How the Front Air BagsWork When air bag crash sensors detect a frontal impact of greater than moderate force, an electrical current is sent to the inflators. Gases are produced to inflate the fro ...

Fuses
Your vehicle's electrical system is protected by fuses. If any lights, accessories, or controls don't work, inspect the appropriate circuit protector. If a fuse has blown, the inside element will ...

Under the Hood
The 2.0-liter four-cylinder in the Mazda3 i has variable valve timing and develops 148 horsepower (144 hp in PZEV form). The Mazda3 s uses a 2.3-liter four-cylinder that pumps out 156 hp. A five-s ...