Intake Side

Camshaft position sensor RH
1. Disconnect the ground cable from battery.
  
  Fig 1: Disconnecting Ground Cable From Battery
  Courtesy of SUBARU OF AMERICA, INC.
2. Disconnect the connector (A) from the camshaft position sensor RH, and remove the camshaft position sensor RH from the rear side of the cylinder head.
  
  Fig 2: Locating Camshaft Position Sensor RH Mounting Bolt
  Courtesy of SUBARU OF AMERICA, INC.
Camshaft position sensor LH
1. Disconnect the ground cable from battery.
  
  Fig 3: Disconnecting Ground Cable From Battery
  Courtesy of SUBARU OF AMERICA, INC.
2. Remove the intake manifold. < Refer to REMOVAL , Intake Manifold. >
3. Remove the camshaft position sensor LH.
  
  Fig 4: Locating Camshaft Position Sensor LH And Bolt
  Courtesy of SUBARU OF AMERICA, INC.