Mazda 6 Service Manual: No.20 noise occurs at idle when vehicle is stopped in all positions/ranges

No.19 excessive shift shock on torque converter clutch (tcc)

No.21 noise occurs at idle when vehicle is stopped in d, s, l ranges, or in r position

Other materials:

Mazda 6 Service Manual: Parking in an Emergency
The hazard warning lights should always be used when you stop on or near a roadway in an emergency. The hazard warning lights warn other drivers that your vehicle is a traffic hazard and that they must take extreme caution when near it. Depress the hazard warning flasher and all the turn s ...

Mazda 6 Service Manual: Rear View Monitor
The rear view monitor provides visual images of the rear of the vehicle when reversing. WARNING Always drive carefully confirming the safety of the rear and the surrounding conditions by looking directly with your eyes: Reversing the vehicle by only looking at the screen is dangerous as it m ...