Mazda 6 Service Manual: No.22 vibration concerns (engine)

No.21 engine noise

No.23 a/c does not work sufficiently

Other materials:

Mazda 6 Service Manual: Lights-On Reminder
The lights-on reminder is operable when the time setting*1 of the auto headlight off function is off. If lights are on and the ignition is switched to ACC or off, a continuous beep sound will be heard when the driver's door is opened. *1 If the light switch is left on, the auto headlight off f ...

Mazda 6 Service Manual: Intake air temperature (iat) sensor inspection
Resistance Inspection Note Perform the following inspection only when directed. 1. Disconnect MAF/IAT sensor. 2. Measure the resistance between the MAF/IAT sensor terminals D and E using an ohmmeter. If not as specified, replace the MAF/IAT sensor. If the MAF/IAT sensor is okay, but ...