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: Side protector removal
1. Pry the side protector end 20-30 mm {0.8-1.1 in} using a flathead screwdriver or a razor. Warning Using a razor with bare hands can cause injury. Always wear gloves when using a razor. Note The side protector is installed with double-sided adhesive tape. If the side protector ...

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 ...