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 MANUALSSUBARU2004BAJA BASE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSFUEL INJECTION (FUEL SYSTEMS) (H4SO)REAR OXYGEN SENSORINSTALLATION

2004 Subaru Baja Base, Standard

Rear Oxygen Sensor: Installation

2004 Subaru Baja Base, StandardSECTION Installation

Before installing rear oxygen sensor, apply anti-seize compound only to threaded portion of rear oxygen sensor to make the next removal easier.
CAUTION: Never apply anti-seize compound to protector of rear oxygen sensor.
1. Anti-seize compound: SS-30 by JET LUBE
Install rear oxygen sensor.
1. Tightening torque: 21 N.m (2.1 kgf-m, 15.2 ft-lb)
Fig 1: Installing Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lower the vehicle.
Connect connector to rear oxygen sensor.

Fig 2: Connecting Connector To Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Connect battery ground cable.

Fig 3: Connecting Battery Ground Cable
Courtesy of SUBARU OF AMERICA, INC.

RENDER: 1.0x

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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.