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: Radar Sensors (Rear) (Some models)
Your vehicle is equipped with radar sensors (rear). The following systems also use the radar sensors (rear). Blind Spot Monitoring system (BSM) Rear Cross Traffic Alert (RCTA) The radar sensors (rear) function by detecting the radio waves reflected off a vehicle approaching from the rea ...

Mazda 6 Service Manual: Outside Temperature Display
When the ignition is switched ON, the outside temperature is displayed. NOTE Under the following conditions, the outside temperature display may differ from the actual outside temperature depending on the surroundings and vehicle conditions: Significantly cold or hot temperatures. Sudden ...