Intake Side

Camshaft position sensor RH
1. Disconnect the ground cable from the battery.
  
  Fig 1: Identifying Battery Ground Cable
  Courtesy of SUBARU OF AMERICA, INC.
2. Disconnect the connector from camshaft position sensor RH.
3. Remove the camshaft position sensor RH from the rear side of the cylinder head.
  
  Fig 2: Locating Camshaft Position Sensor RH And Bolt
  Courtesy of SUBARU OF AMERICA, INC.
Camshaft position sensor LH
1. Disconnect the ground cable from the battery.
  
  Fig 3: Identifying Battery Ground Cable
  Courtesy of SUBARU OF AMERICA, INC.
2. Remove the intake manifold. Ref. to REMOVAL , Intake Manifold.
3. Remove the camshaft position sensor LH from the rear side of the cylinder head.
  
  Fig 4: Locating Camshaft Position Sensor LH And Bolt
  Courtesy of SUBARU OF AMERICA, INC.