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.

2006 Subaru Outback RFACTORY OEM SERVICE PROCEDURE

Rear Oxygen Sensor: Installation

Before installing rear oxygen sensor, apply the anti-seize compound only to the threaded portion of rear oxygen sensor to make the next removal easier.
Anti-seize compound: NEVER-SEEZ NS-165 or the equivalent

CAUTION: Never apply anti-seize compound to the protector of rear oxygen sensor.
Install the rear oxygen sensor.
Tightening torque: 21 N.m (2.1 kgf-m, 15.2 ft-lb)
- LH side
  
  Fig 1: Locating Rear Oxygen Sensor (LH Side)
- RH side
  
  Fig 2: Locating Rear Oxygen Sensor (RH Side)
Hold the harness with clip.
Connect the connector to rear oxygen sensor.
- LH side
  
  Fig 3: Locating Rear Oxygen Sensor Connector (LH Side)
- RH side
  
  Fig 4: Locating Rear Oxygen Sensor Connector (RH Side)
Lower the vehicle.
Connect the battery ground cable to the battery.

Fig 5: Connecting Ground Cable To Battery

Chapter Navigation

Return to Chapter: Rear Oxygen Sensor

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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.