Mazda 6 Service Manual: No.5 engine stalls-after start/at idle

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

No.6 cranks normally but will not start

Other materials:

Mazda 6 Service Manual: Smart City Brake Support (SCBS)
The Smart City Brake Support (SCBS) system alerts the driver of a possible collision using an indication in the display and a warning sound when the Forward Sensing Camera (FSC) detects a vehicle ahead and determines that a collision with a vehicle ahead is unavoidable while the vehicle is bei ...

Mazda 6 Service Manual: Changing a Flat Tire
NOTE If the following occurs while driving, it could indicate a flat tire. Steering becomes difficult. The vehicle begins to vibrate excessively. The vehicle pulls in one direction. If you have a flat tire, drive slowly to a level spot that is well off the road and out of the way of tr ...