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/CODESSPECIFICATION CODES IDENTIFICATION
1991 Subaru Legacy L, 4D Sedan, AWD, Standard
Specification Codes Identification
1991 Subaru Legacy L, 4D Sedan, AWD, StandardSECTION Specification Codes Identification
Specification codes are codes accessed with trouble code(s) from ECU. These codes determine transmission and vehicle emissions application. Specification code is not available on carbureted models.
SPECIFICATION CODES (1)
| Code | Application | ||
|---|---|---|---|
| 01 | M/T (Non-Turbo), Canada & Fed. | ||
| 02 | M/T (Non-Turbo), Calif. | ||
| 03 | A/T (Non-Turbo), Canada & Fed. | ||
| 04 | A/T (Non-Turbo), Calif. | ||
| 05 | M/T (Turbo), Canada & Fed. | ||
| 06 | M/T (Turbo), Calif. | ||
| 07 | A/T (Turbo), Canada & Fed. | ||
| 08 | A/T (Turbo), Calif. | ||
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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.