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 MANUALSSUBARU1991LEGACY L, 4D SEDAN, AWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESDIAGNOSTIC CODE CHARTSD-CHECK MODE
1991 Subaru Legacy L, 4D Sedan, AWD, Standard
D-Check Mode
1991 Subaru Legacy L, 4D Sedan, AWD, StandardSECTION D-Check Mode
NOTE:
When the engine operates at a speed greater than 2000 RPM for more than 40 seconds, a trouble code is displaued, or the check engine light blinks. However, when all check items check out "OK", even before the 40 seconds is reached, the check engine light blinks.
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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.