WARNING: This page is about a different car, the 2012 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Engine Sensors
Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Identifying Connectors
Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Identifying Oxygen Sensors, Front And Rear Catalytic Converter