Mazda CX-9 AWD (All Wheel Drive) Transfer Case.
Do you have these problems?
It starts out as a noise from the front end usually on the passengers side when turning @ low speed. Most commonly heard while in a car park as it will echo off the walls and can get quite loud as it gets worse. The next symptom is a bad burning oil smell in the car due to the fresh air setting on the climate control. The final sign is a locking sensation of the wheel while reversing. It starts out as not much but it will come and go in the beginning but left to long it will cause the vehicle to bind up in reverse and it will feel like your foots on the brake while trying to accelerate in reverse.
If so this is the problem
Replace it with a new Mazda Factory Transfer Case