Mazda 6 Service Manual: No.3 will not crank

No.2 mil illuminates

No.4 hard to start/long crank/erratic start/erratic crank

Other materials:

Mazda 6 Service Manual: Installation of radio system
If a radio system is installed improperly or if a high-powered type is used, the CIS and other systems may be affected. When the vehicle is to be equipped with a radio, observe the following precautions: Install the antenna at the farthest point from control modules. Install the antenna fe ...

Mazda 6 Service Manual: Jam-safe Moonroof
If a person's hands, head or an object blocks the moonroof while it is closing, the moonroof will stop and move in the reverse direction. WARNING Make sure nothing blocks the moonroof just before it reaches the fully closed position: Blocking the moonroof just before it reaches the closed posi ...