Mazda 6 Service Manual: No.2 vehicle moves in n position

No.1 vehicle does not move in d, s, l ranges, or in r position

No.3 vehicle moves in p position, or parking gear does not disengage when p is disengaged

Other materials:

Mazda 6 Service Manual: Manually Shifting Down
You can shift gears down by operating the selector lever or the steering shift switches (some models). M6 → M5 → M4 → M3 → M2→ M1 Using selector lever To shift down to a lower gear, tap the selector lever forward (-) once. Using steering shift switch (Some model ...

Mazda 6 Service Manual: High-mount brake light removal/installation
4SD In-vehicle-type 1. Disconnect the negative battery cable. 2. Remove in the order indicated in the table. 3. Install in the reverse order of removal. Rear spoiler type 1. Disconnect the negative battery cable. 2. Remove the rear spoiler. (See REAR SPOILER REMOVAL/INSTALLATION) 3. Remo ...