RH Side

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Remove the collector cover.
Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Remove the air cleaner case. < Refer to REMOVAL , Air Cleaner Case. >
Disconnect the connector from ignition coil.
Remove the ignition coil.
NOTE: Turn #3 ignition coil by 180° to remove it.

Fig 2: Locating Ignition Coil Connector
Courtesy of SUBARU OF AMERICA, INC.
Remove the spark plug with a spark plug socket.
Install in the reverse order of removal.
Tightening torque (Spark plug):

21 N.m (2.1 kgf-m, 15.5 ft-lb)

Tightening torque (Ignition coil):

16 N.m (1.6 kgf-m, 11.8 ft-lb)