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: Manual Shift Mode
The manual shift mode gives you the feel of driving a manual transaxle vehicle by allowing you to operate the selector lever manually. This allows you to control engine rpm and torque to the drive wheels much like a manual transaxle when more control is desired. To change to manual shift mode ...

Mazda 6 Service Manual: Locking, Unlocking with Door- Lock Knob
Operation from inside To lock any door from the inside, press the door-lock knob. To unlock, pull it outward. This does not operate the other door locks. NOTE The red indication can be seen when the door-lock knob is unlocked. Operation from outside To lock the rear and front passenger doo ...