Throttle Body: Removal

Remove the collector cover.
1. Carefully pull up the rear of collector cover at two positions (A).
2. Carefully pull up the front of collector cover at two positions (B) while moving it forward.
  
  Fig 1: Removing Collector Cover
  Courtesy of SUBARU OF AMERICA, INC.
Disconnect the ground terminal from battery sensor. < Ref. to BATTERY , NOTE, Repair Contents. >
Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. < Ref. to DRAINING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant. >
Loosen the clamp (A) securing the air intake boot.
Remove the bolt (B) securing the air intake boot to the collector cover bracket.

Fig 2: Identifying Air Intake Boot Clamp And Bolts
Courtesy of SUBARU OF AMERICA, INC.
Remove the air intake boot from the throttle body and the air cleaner case (rear), and move it to the left side wheel apron.

Fig 3: Identifying Throttle Body Air Intake Boot
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the connector (A) from the throttle position sensor, and disconnect the preheater hose (B) from the throttle body.
Remove the throttle body from the intake manifold.

Fig 4: Locating Throttle Position Sensor Bolts
Courtesy of SUBARU OF AMERICA, INC.