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: Brake/Clutch Fluid
Inspecting Brake/Clutch Fluid Level WARNING If the brake/clutch fluid level is low, have the brakes inspected: A low brake/clutch fluid level is dangerous. A low level could indicate brake lining wear or a brake system leak which could cause the brakes to fail and lead to an accident. The b ...

Mazda 6 Service Manual: Hold switch inspection
Operating Inspection 1. Turn the ignition switch to ON (engine OFF). 2. Verify that the HOLD indicator light is not illuminated. Depress the HOLD switch and verify that the HOLD indicator light illuminates. If not as specified, inspect the terminal voltage of the HOLD switch. Voltage Insp ...