Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Subaru Outback F4-2.5L SOHCFACTORY OEM SERVICE PROCEDURE
Spark Plug: Service and Repair
Ignition System:
Ignition System:
Spark Plug
REMOVAL
RH SIDE
1. Disconnect the ground cable from battery.
2. Remove the air cleaner case.
3. Remove the spark plug cords by pulling the boot. (Do not pull the cord itself.)
4. Remove the spark plug with a spark plug socket.
LH SIDE
1. Remove the battery.
2. Remove the spark plug cords by pulling the boot. (Do not pull the cord itself.)
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
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
