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: Direct Mode
Direct mode can be used for temporarily switching gears by operating the steering shift switch while the vehicle is being driven with the selector lever in the D range. While in direct mode, the D and M indication illuminate and the gear position in use is illuminated. Direct mode is canceled ...

Mazda 6 Service Manual: C-pillar trim removal/installation
4SD 1. Remove the tire house trim. 2. Turn the seaming welt over. 3. Remove the cap using a fastener remover, and remove the bolt (with curtain air bag system). 4. Disengage clips A and clip B using a fastener remover. 5. Pull the C-pillar trim forward, then disengage hook C from the body, ...