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

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Mazda 6 Service Manual: Front/rear abs wheel-speed sensor inspection
Visual Inspection Remove the wheel and tire, and inspect the sensor for looseness and damage. Replace the sensor if necessary. Clearance Inspection Inspect the clearance between the wheel-speed sensor and the sensor rotor. Clearance 0.3-1.1 mm {0.012-0.043 in} Resistance Inspection ...

Mazda 6 Service Manual: Rear brake (disc) inspection
Brake Judder Repair Hint 1. (See FRONT BRAKE (DISC) INSPECTION.) Disc Plate Thickness Inspection Caution Excessive runout may result if the disc plate is removed from the vehicle then machined. Machine the disc plate while installed on the vehicle. 1. Measure the thickness of the dis ...