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: Camshaft position (cmp) sensor inspection
Caution When foreign material such as an iron chip is on the CMP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect the engine control. Be sure there is no foreign material on the CMP sensor when replacing. Note Perform the follow ...

Mazda 6 Service Manual: Rear door speaker removal/installation
1. Disconnect the negative battery cable. 2. Remove the rear door trim. 3. Remove in the order indicated in the table. 4. Install in the reverse order of removal. Rear Door Speaker Installation Note Attach the speaker with the wiring harness placed in the groove of the door unit panel. ...