Front Door

WARNING: This page is about a different car, the 2016 Subaru Outback and 2016 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Raise the glass assembly - front door to the top position.
Remove the cover - handle front outer.
Preparation tool:

TORX® T30
1. Remove the plug at the rear end of the panel assembly - front door.
2. Loosen the TORX® bolt and remove the cover - handle front outer.
  
  Fig 1: Removing Handle Front Outer Cover
  Courtesy of SUBARU OF AMERICA, INC.
Remove the key cylinder (B) from the cover - handle front outer (A), and replace the key cylinder.

Fig 2: Identifying Key Lock Cylinder
Courtesy of SUBARU OF AMERICA, INC.