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.
2017 Subaru Outback 2.5iFACTORY OEM SERVICE PROCEDURE
Waveform 3
| Measured terminal | Rear oxygen sensor (+) signal (E158) No. 57 (+) - Rear oxygen sensor (-) signal (E158) No. 56 (-): |
| Engine speed (current data display of engine) | |
| Throttle opening angle (current data display of engine) | |
| Measuring condition | (a) Accelerator pedal fully closed (b) Accelerator pedal half open (c) Accelerator pedal fully opened |
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.
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