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: Side air bag sensor removal/installation
Warning Handling the side air bag sensor improperly can accidentally deploy the side air bag module, which may seriously injure you. Read AIR BAG SYSTEM SERVICE WARNINGS before handling the side air bag sensor. (See SERVICE WARNINGS.) 1. Turn the ignition switch to LOCK position. 2. ...

Mazda 6 Service Manual: Clutch pedal adjustment
Clutch Pedal Height Measure the distance from the upper surface of the pedal pad to the carpet. If not as specified, adjust the pedal height by turning adjustment bolt B and locknut A. Pedal height(with carpet) L.H.D.: 210-216 mm {8.27-8.50 in} R.H.D.: 209-215 mm {8.23-8.46 in} ...