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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSUBARU2002LEGACY L SEDAN AWD F4-2.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIRREMOVAL AND INSTALLATION
2002 Subaru Legacy L Sedan AWD F4-2.5L SOHC
Removal and Installation
2002 Subaru Legacy L Sedan AWD F4-2.5L SOHCSECTION Removal and Installation
Ignition System:
REMOVAL
CAUTION: All spark plugs installed on an engine, must be of the same heat range.
Spark plug:
CHAMPION: RC10YC4
(Alternate)
NGK: BKR5E-11
NGK: BKR6E-11
RH SIDE
1. Disconnect battery ground cable.
2. Remove resonator chamber.
3. Remove spark plug cords by pulling boot, not cord itself.
4. Remove spark plugs with the spark plug socket.
LH SIDE
1. Disconnect battery ground cable.
2. Disconnect washer motor connector.
3. Disconnect rear window glass washer hose from washer motor, then plug connection with a suitable cap.
4. Remove the two bolts which hold the washer tank, then take the tank away from the working area.
5. Remove spark plugs cord by pulling boot, not cord itself.
6. Remove spark plug with the spark plugs socket.
INSTALLATION
RH SIDE
1. Install in the reverse order of removal.
Tightening torque (Spark plug): 21 Nm (2.1 kgf-m, 15 ft-lb)
CAUTION: 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 approximately 1/3 of the specified torque in order to avoid over-stressing.
Tightening torque (Resonator chamber): 33 Nm (3.4 kgf-m, 24.6 ft-lb)
LH SIDE
1. Install in the reverse order of removal.
Tightening torque (Spark plug): 21 Nm (2.1 kgf-m, 15 ft-lb)
CAUTION: 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 approximately 1/3 of the specified torque in order to avoid over-stressing.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.