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: Gear Shift Indicator (GSI)
The Gear Shift Indicator (GSI) supports you to obtain optimum fuel economy and smooth driving. It displays the selected gear position in the instrument cluster as well as notifies the driver to change to the most suitable gear position corresponding to the actual driving condition. CAUTIO ...

Mazda 6 Service Manual: Clock spring adjustment
Note The adjustment procedure is also specified on the caution label of the clock spring. 1. Set the front wheels straight ahead. Caution The clock spring will break if over-wound. Do not forcibly turn the clock spring. 2. Turn the clock spring clockwise until it stops. 3. Tu ...