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: Bluetooth® Preparation
Device pairing To use Bluetooth® audio and Hands-Free, the device equipped with Bluetooth® has to be paired to the unit using the following procedure. A maximum of seven devices including Bluetooth® audio devices and hands-free mobile phones can be paired. NOTE The Bluetooth® system ma ...

Mazda 6 Service Manual: Relay inspection
Relay Type Four-terminal Type A 1. Remove the relay. 2. Inspect for continuity between the relay terminals using an ohmmeter. If not as specified, replace the relay. Type B 1. Remove the relay. 2. Inspect for continuity between the relay terminals using an ohmmeter. If not as ...