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: Cleaning the Floor Mats
Rubber floor mats should be cleaned with mild soap and water only. WARNING Do not use rubber cleaners, such as tire cleaner or tire shine, when cleaning rubber floor mats: Cleaning the rubber floor mats with rubber cleaning products makes the floor mats slippery. This may cause an accident whe ...

Mazda 6 Service Manual: Instrument cluster input/output check mode
Note In this mode, it is possible to check the items in the following chart. Diagnostic Trouble Code Chart Note Diagnostic trouble codes which are not listed may be indicated, but they cannot be inspected. The diagnostic trouble codes are displayed in numerical order. (While ...