If your Mazda Millenia fails to start, and the starter is working properly, the next thing to check is the ignition switch. Typically if you have to play with the key to get the Mazda Millenia starter to crank, the switch is failing. We recommend replacing the Mazda Millenia starter switch as soon as you notice the switch beginning to fail. This will keep you from getting stranded. The Mazda Millenia neutral safety switch on vehicles with automatic transmissions can also fail causing the car not to start.