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: Egr valve inspection
Operation Test Carry out the EGR Control Inspection. (See EGR Control System Inspection. If not as specified, perform the further inspection for the EGR valve. Resistance Inspection Note Perform the following test only when directed. 1. Disconnect the negative battery cable. 2. In ...

Mazda 6 Service Manual: No.9 noise while operating a/c system
Diagnostic procedure * : If there is gas leakage, air enters into the A/C system. The desiccant within the receiver/drier absorbs the moisture from the air and becomes saturated. If the A/C system is used in this condition, the inside of the A/C compressor will begin to rust due to this ...