Operation CHARM: Car repair manuals for everyone.
Home >> Subaru >> 2009 >> Impreza F4-2.5L SOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Oxygen Sensor >> Service and Repair >> Rear Oxygen Sensor
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Rear Oxygen Sensor

Rear Oxygen Sensor

REMOVAL
1. Set the vehicle on a lift.
2. Disconnect the ground cable from battery.






3. Remove the air intake duct.
4. Remove the clip fastening the harness and disconnect the rear oxygen sensor connector.






5. Lift up the vehicle.
6. Remove the under cover.
7. Apply spray-type lubricant to the threaded portion of rear oxygen sensor, and leave it for one minute or more.
8. Remove the rear oxygen sensor.

CAUTION: When removing the rear oxygen sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.






INSTALLATION

CAUTION: If lubricant is spilt onto the exhaust pipe, wipe it off completely with cloth to avoid emission of smoke or causing a fire.

1. 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.

CAUTION: Never apply anti-seize compound to the protector of rear oxygen sensor.

Anti-seize compound:
NEVER-SEEZ NSN, JET LUBE SS-30 or equivalent

2. Install the rear oxygen sensor.






3. Install the under cover.
4. Lower the vehicle.
5. Connect the rear oxygen sensor connector and fasten the harness with clips.






6. Connect the ground cable to battery.




pro multis · About Operation CHARM