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: Parking brake (lever type) adjustment
1. Start the engine and depress the brake pedal several times. 2. Stop the engine. 3. Remove the ashtray behind the center console. 4. Turn the adjusting nut as shown in the figure. 5. After adjustment, inspect the following points: (1) Turn the ignition switch to ON, pull the parking brak ...

Mazda 6 Service Manual: Operational Range
The system operates only when the driver is in the vehicle or within operational range while the key is being carried. Starting the Engine NOTE Starting the engine may be possible even if the key is outside of the vehicle and extremely close to a door and window, however, always start the ...