Inspect the belt for cracks or damage. If the belt is cracked or damaged, replace it.
Check that the position of the auto-tensioner indicator (A) is within the standard range (B) as shown. If it is out of the standard range, replace the drive belt.

Engine Oil/Air Separator Installation
Remove all of the old liquid gasket from the oil/air separator mating
surfaces, the bolts, and the bolt holes.
Clean and dry the oil/air separator mating surfaces.
App ...
Installation (Part -1)
Before installing the steering gearbox, make sure that no grease is on
the mating surface of the steering gearbox and the front subframe. To
prevent the gearbox mounting bolts from looseni ...
Driver's Airbag Replacement
NOTE:
If replacing the driver's airbag after deployment, refer to
Component Replacement/Inspection After Deployment for a
complete list of other parts that must also be replaced.
...