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.
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HOMESERVICE MANUALSSUBARU2002LEGACY GT WAGON AWD F4-2.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIRFRONT OXYGEN (A/F) SENSOR
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHC
Front Oxygen (A/F) Sensor
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHCSECTION Front Oxygen (A/F) Sensor
REMOVAL
1. Disconnect battery ground cable.
2. Disconnect connector from front oxygen (A/F) sensor.
3. Lift-up the vehicle.
4. Apply SUBARU CRC or its equivalent to threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
SUBARU CRC (Part No.004301003)
5. Remove front oxygen (A/F) sensor.
CAUTION: When removing the oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage exhaust pipe.
INSTALLATION
1. Before installing front oxygen (A/F) sensor, apply anti-seize compound only to threaded portion of front oxygen (A/F) sensor to make the next removal easier.
Anti-seize compound:
SS-30 by JET LUBE
CAUTION: Never apply anti-seize compound to protector of front oxygen (A/F) sensor.
2. Install front oxygen (A/F) sensor.
Tightening torque: 21 Nm (2.1 kgf-m, 15.2 ft-lb)
3. Lower the vehicle.
4. Connect connector of front oxygen (A/F) sensor.
5. Connect battery ground cable.
1. Disconnect battery ground cable.
2. Disconnect connector from front oxygen (A/F) sensor.
3. Lift-up the vehicle.
4. Apply SUBARU CRC or its equivalent to threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
SUBARU CRC (Part No.004301003)
5. Remove front oxygen (A/F) sensor.
CAUTION: When removing the oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage exhaust pipe.
INSTALLATION
1. Before installing front oxygen (A/F) sensor, apply anti-seize compound only to threaded portion of front oxygen (A/F) sensor to make the next removal easier.
Anti-seize compound:
SS-30 by JET LUBE
CAUTION: Never apply anti-seize compound to protector of front oxygen (A/F) sensor.
2. Install front oxygen (A/F) sensor.
Tightening torque: 21 Nm (2.1 kgf-m, 15.2 ft-lb)
3. Lower the vehicle.
4. Connect connector of front oxygen (A/F) sensor.
5. Connect battery ground cable.
RENDER: 1.0x
NO RELATED
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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.