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.

2021 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE

Secondary Pressure Sensor: Inspection

Check for oil leaks.
Check [secondary pressure sensor voltage.] of the secondary pressure sensor.
1. Connect the Subaru Select Monitor.
2. Turn the ignition switch to ON. (Engine OFF)
3. Display [secondary pressure sensor voltage.].
4. Start the engine and warm up completely.
5. Turn OFF the pre-collision brake function.
6. Turn the VDC function OFF.
7. Lift up the vehicle.
  CAUTION:
  - Lift up the vehicle until the tire bottom is 0.3 m (0.98 ft) or more above the ground.
  - Make sure that safety is secured where the tiers rotate.
8. Release the parking brake.
9. Shift the select lever to "D range".
10. Release the brake pedal, and rotate the tires.
  NOTE: Rotate the tires until the vehicle speed reaches or exceeds 2 km/h (1.2 MPH).
11. Depress the brake pedal to stop the tire rotation.
12. Shift the select lever to "P range".
13. Apply the parking brake.
14. Check [secondary pressure sensor voltage.] with the vehicle idling.
  Specification:
  
  Approx. 1.0 V
15. Stop the engine.
16. Turn the ignition switch to ON. (Engine OFF)
17. Check [secondary pressure sensor voltage.].
  Specification:
  
  Approx. 0.5 V

Chapter Navigation

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Factory Service Tools

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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.