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 MANUALSSUBARU2004BAJA BASE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIA (H4SO)DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIADTC P0604: INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERRORGENERAL DRIVING CYCLE
2004 Subaru Baja Base, Standard
General Driving Cycle
2004 Subaru Baja Base, StandardSECTION General Driving Cycle
Perform the diagnosis only once immediately after the IG key is turned to ON.
RENDER: 1.0x
NO RELATED
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.