Throttle Body: Removal

Disconnect the ground terminal from battery sensor. Ref. to BATTERY
Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. Ref. to DRAINING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant.
Remove the clip (A), and loosen the clamps (B) and (C) securing the air intake boot.

Fig 1: Identifying Air Intake Boot Clip And Clamps
Courtesy of SUBARU OF AMERICA, INC.
Remove the air intake boot from the air cleaner case (rear) and throttle body, and move it to the left side wheel apron.

Fig 2: Removing Air Intake Boot
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the connectors (A) from the throttle position sensor.
Disconnect the preheater hose (B) from the throttle body.
Remove the throttle body from the intake manifold assembly.

Fig 3: Locating Throttle Body Bolts, Hose And Throttle Position Sensor Connectors

Courtesy of SUBARU OF AMERICA, INC.