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 4
WARNING: This page is about a different variant/trim than selected.
| Measured terminal | Front oxygen (A/F) sensor RH heater signal (E158) No. 5 (+) - Engine ground 3 (E158) No. 63: |
| Front oxygen (A/F) sensor LH heater signal (E158) No. 4 (+) - Engine ground 3 (E158) No. 63: | |
| Rear oxygen sensor RH heater signal (E158) No. 10 (+) - Engine ground 3 (E158) No. 63: | |
| Rear oxygen sensor LH heater signal (E158) No. 11 (+) - Engine ground 3 (E158) No. 63: | |
| Measuring condition | While engine idling |
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.