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 ...

Keyless Entry System
This system remotely locks and unlocks the doors and the liftgate, and opens the power windows and the moonroof. It can also help you signal for attention. Press the buttons slowly and carefully. ...

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 ...