1. Verify that the joint shaft is not twisted or cracked.
2. Turn the joint shaft by hand and verify that the bearing rotates smoothly and freely.

Drive shaft
Joint shaft removal/installationMazda 6 Service Manual: Power Steering
Power steering is only operable when the engine is running. If the engine
is off or if the power steering system is inoperable, you can still steer, but
it requires more physical effort. If the steering feels stiffer than usual
during normal driving or the steering vibrates, consult an A ...
Mazda 6 Service Manual: Outside Mirrors
WARNING
Be sure to look over your shoulder before changing lanes: Changing
lanes without taking into account the actual distance of the vehicle in the convex
mirror is dangerous. You could have a serious accident. What you see in the convex
mirror is closer than it appears.
Mirror type
Flat ...