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.

2003 Subaru Baja AutomaticFACTORY OEM SERVICE PROCEDURE

Rear Oxygen Sensor: 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
Fig 1: Apply Anti-Seize Compound
Courtesy of SUBARU OF AMERICA, INC.
Install rear oxygen sensor.
1. Tightening torque: 21 N.m (2.1 kgf-m, 15.2 ft-lb)
Fig 2: Installing Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lower the vehicle.
Connect connector to rear oxygen sensor.

Fig 3: Connecting Connector To Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Connect battery ground cable.

Fig 4: Connecting Battery Ground Cable
Courtesy of SUBARU OF AMERICA, INC.

Chapter Navigation

Return to Chapter: Rear Oxygen Sensor

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready Tools Compare Repair Quote Quote Shield Pro

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.