Subaru Impreza 2.2L MT Owner's Manual page 300

Lock pin
2. Grasp the wheel cover with both hands by the spokes and twist
sharply in a clockwise direction until you feel the detent locking. After
twisting the wheel cover, make sure the wheel cover is locked
securely by lightly turning the wheel cover right and left.
NOTE
When any of the wheels is removed and replaced for tire rotation or to
change a flat tire, always check the tightness of the wheel nuts after driv-
ing approximately 600 miles (1,000 km). If any nut is loose, tighten it to
the specified torque.
10-44
HG0126
HG0124