FUEL INJECTION (FUEL SYSTEMS)(H4DO) > Front Oxygen (A/F) Sensor
INSTALLATION
CAUTION:
If lubricant is spilt over the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.
1. Before installing front oxygen (A/F) sensor, apply anti-seize compound only to the threaded portion of front oxygen (A/F) sensor to make the next removal easier.
CAUTION:
Never apply anti-seize compound to the protector of front oxygen (A/F) sensor.
Anti-seize compound:
NEVER-SEEZ NSN, JET LUBE SS-30 or equivalent
2. Install the front oxygen (A/F) sensor.
Tightening torque:
21 N·m (2.1 kgf-m, 15.5 ft-lb)

3. Lift up the vehicle.
4. Connect the front oxygen (A/F) sensor connector, and secure the front oxygen (A/F) sensor harness by using the clip.

(A) | Front oxygen (A/F) sensor connector | (B) | Rear oxygen sensor connector | (C) | Clip |
5. Install the under cover. Front Under Cover > INSTALLATION">
6. Lower the vehicle.
7. Install the radiator sub fan and fan motor assembly. Radiator Sub Fan and Fan Motor > INSTALLATION">
8. Connect the battery ground terminal.

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BSD/RCTA OFF indicator
System temporary stops
BSD/RCTA temporary stop message
BSD/RCTA OFF indicator
In the Subaru Ascent, this message is displayed when the BSD/RCTA system is temporarily
suspended due to external or internal conditions that prevent accurate operation.
Extremely high or extremely low a ...