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 MANUALSSUBARU1990XT-6 4WD L6-2.7L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIR
1990 Subaru XT-6 4WD L6-2.7L SOHC
Oxygen Sensor: Service and Repair
1990 Subaru XT-6 4WD L6-2.7L SOHCSECTION Service and Repair
Oxygen Sensor Replacement:
Removal
NOTE: Do not use excessive force to remove the oxygen sensor, especially when the exhaust manifold is cold. Damage to the manifold may result.
1. Disconnect sensor harness connector.
2. Apply SUBARU CRC (004301003) or equivalent to oxygen sensor threads and let stand for at least one minute.
3. Loosen oxygen sensor by turning it 10 to 40 degrees with special tool (SOCKET: 499990110) and wrench.
4. Repeat application of SUBARU CRC (004301003) or equivalent and let stand again for at least one minute.
5. Finish removing the sensor.
Installation
NOTE: Never apply anti-seize compound to the louvred end of the oxygen sensor.
1. Apply anti-seize compound only to threaded portion of oxygen sensor.
2. Install sensor in manifold with socket and wrench and torque to 25-34 N-m (18-25 ft-lb).
3. Connect sensor harness connector.
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.