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: Selector lever disassembly/assembly
1. Disassemble in the order shown in the figure. 2. Assemble in the reverse order of disassembly. Connector Disassembly Note 1. Insert a thin piece of metal from the terminal side of the connector, and press down the terminal locking tab. 2. Pull the terminal out of the connector. ...