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.
1992 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Clearing Codes
- Turn ignition off. Remove EFI fuse for at least 10 seconds. On LS400, EFI fuse (20A) is located in junction block No. 2. This junction block is located in left front engine compartment.
- On SC400 models, EFI fuse (30A) is located in relay block at left strut tower. On all models, codes can also be cleared by disconnecting negative battery cable.
NOTE:
If disconnecting negative battery cable to clear codes, reset clock and radio memory. After clearing codes, ensure a normal code is shown on CHECK ENGINE light.
Factory Service Tools
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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.
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