2005 Subaru Outback F4-2.5L SOHCFACTORY OEM SERVICE PROCEDURE

Spark Plug: Service and Repair

Ignition System:

Factory service manual diagram



Ignition System:

Factory service manual diagram





Spark Plug

REMOVAL

RH SIDE

Factory service manual diagram



1. Disconnect the ground cable from battery.
2. Remove the air cleaner case.

Factory service manual diagram



3. Remove the spark plug cords by pulling the boot. (Do not pull the cord itself.)

Factory service manual diagram



4. Remove the spark plug with a spark plug socket.

LH SIDE
1. Remove the battery.

Factory service manual diagram



2. Remove the spark plug cords by pulling the boot. (Do not pull the cord itself.)

Factory service manual diagram



3. Remove the spark plug with a spark plug socket.

INSTALLATION

RH SIDE
Install in the reverse order of removal.

Tightening torque: 21 N.m (2.1 kgf-m, 15.2 ft-lb)

NOTE: The above torque should be only applied to new spark plugs without oil on their threads. In case their threads are lubricated, the torque should be reduced by approx. 1/3 of the specified torque in order to avoid over-stressing.

LH SIDE
Install in the reverse order of removal.

Tightening torque: 21 N.m (2.1 kgf-m, 15.2 ft-lb)

NOTE: The above torque should be only applied to new spark plugs without oil on their threads. In case their threads are lubricated, the torque should be reduced by approx. 1/3 of the specified torque in order to avoid over-stressing.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.