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: Shift Gear (Shifting) Speed Limit
For each gear position while in the manual mode, the speed limit is set as follows: When the selector lever is operated within the range of the speed limit, the gear is shifted. Shift up The gear does not shift up while the vehicle speed is lower than the speed limit. Shift down The gear d ...

Mazda 6 Service Manual: Hazard Warning Flasher
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 ...