LH Side

Remove the collector cover.
Remove the battery and battery carrier.
Disconnect the air duct from the secondary air pump.

Fig 1: Locating Air Duct Mounting Bolt And Hose Clamp
Courtesy of SUBARU OF AMERICA, INC.
Remove the bolts that attach the air pump duct to the rocker cover LH, and raise the air pump duct.
Disconnect the connector from ignition coil.
1. Install in the reverse order of removal.
Remove the ignition coil.
NOTE: Turn #4 ignition coil by 180° to remove it.

Fig 2: Locating Ignition Coil Mounting Bolt
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)

Tightening torque (Air duct):

6.4 N.m (0.7 kgf-m, 4.7 ft-lb)