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.
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HOMESERVICE MANUALSSUBARU2007OUTBACK LIMITED, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIA (H4SO)DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIADTC P0139 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 2)ENABLE CONDITION
2007 Subaru Outback Limited, 4D Sedan, Standard
Enable Condition
2007 Subaru Outback Limited, 4D Sedan, StandardSECTION Enable Condition
Rich → lean diagnosis response
ENABLE CONDITION
| Secondary Parameters | Enable Conditions |
|---|---|
| Battery voltage | > 10.9 V |
| A/F sub feedback control condition | Completed |
| Deceleration fuel cut time is 6 seconds or more. | Experienced |
| After fuel cut | ≥ 2 seconds |
| Rear oxygen heater current calculation time | ≥ 60 seconds |
| Rear oxygen heater current continuous time | ≥ 30 seconds |
| Catalyst warm up counter (except for U5 model) | ≥ 9000 |
| Estimated catalyst temperature (U5 model) | ≥ 400°C (752°F) |
| Deceleration fuel cut count (U5 model) | ≥ 1 time |
Lean → rich response diagnosis
ENABLE CONDITION
| Secondary Parameters | Enable Conditions |
|---|---|
| Battery voltage | > 10.9 V |
| A/F main feedback control condition | Completed |
| Deceleration fuel cut ≥ 6 seconds | Experienced |
| After fuel cut | ≥ 2 seconds |
| Current calculation time of the rear oxygen sensor heater (except for U5 model) | 0 seconds |
| Current calculation time of the rear oxygen sensor heater (U5 model) | 60 seconds |
| Current continuation time of the rear oxygen sensor heater (except for U5 model) | 0 seconds |
| Current continuation time of the rear oxygen sensor heater (U5 model) | 30 seconds |
RENDER: 1.0x
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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.