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 MANUALSSUBARU1998LEGACY OUTBACK SPORT AWD F4-2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIRFRONT OXYGEN SENSOR
1998 Subaru Legacy Outback Sport AWD F4-2.2L SOHC
Front Oxygen Sensor
1998 Subaru Legacy Outback Sport AWD F4-2.2L SOHCSECTION Front Oxygen Sensor
FRONT OXYGEN SENSOR
REMOVAL
1. Remove Air Intake Duct.
2. Disconnect connector from front oxygen sensor.
3. Lift-up the Vehicle.
4. Apply Subaru CRC (Part No. 004301003) or its equivalent to threaded portion of front oxygen sensor, and leave it for one minute or more.
5. Remove front oxygen sensor.
CAUTION: When removing oxygen sensor, do not force the oxygen sensor especially when the exhaust pipe is cold, otherwise it will damage the exhaust pipe.
INSTALLATION
1. Before installing front oxygen sensor, apply anti-seize compound only to threaded portion of front oxygen sensor to make the next removal easier.
CAUTION: Never apply anti-seize compound to protector of front oxygen sensor.
2. Install front oxygen sensor.
Tightening Torque: 21 ± 3 N.m (15.2 ± 2.2 ft-lb).
3. Lower the vehicle.
4. Connect connector of front oxygen sensor.
5. Install air intake duct.
REMOVAL
1. Remove Air Intake Duct.
2. Disconnect connector from front oxygen sensor.
3. Lift-up the Vehicle.
4. Apply Subaru CRC (Part No. 004301003) or its equivalent to threaded portion of front oxygen sensor, and leave it for one minute or more.
5. Remove front oxygen sensor.
CAUTION: When removing oxygen sensor, do not force the oxygen sensor especially when the exhaust pipe is cold, otherwise it will damage the exhaust pipe.
INSTALLATION
1. Before installing front oxygen sensor, apply anti-seize compound only to threaded portion of front oxygen sensor to make the next removal easier.
CAUTION: Never apply anti-seize compound to protector of front oxygen sensor.
2. Install front oxygen sensor.
Tightening Torque: 21 ± 3 N.m (15.2 ± 2.2 ft-lb).
3. Lower the vehicle.
4. Connect connector of front oxygen sensor.
5. Install air intake duct.
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.