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 MANUALSSUBARU2004OUTBACK BASE, 4D WAGON, EJ251, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE (DIAGNOSTICS) (H4SO)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODESDTC P0172: SYSTEM TOO RICH (BANK 1)TROUBLE SYMPTOM
2004 Subaru Outback Base, 4D Wagon, EJ251, Standard
DTC P0172: System Too Rich (Bank 1): Trouble Symptom
2004 Subaru Outback Base, 4D Wagon, EJ251, StandardSECTION Trouble Symptom
- Erroneous idling
- Engine stalls.
- Poor driving performance
CAUTION:
After repair or replacement of malfunctioning parts, conduct Clear Memory Mode. Refer to
CLEAR MEMORY MODE and Inspection Mode. Refer to
INSPECTION MODE
.
RENDER: 1.0x
NO RELATED
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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.