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.
1990 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
General Periodic Maintenance
Operator should check listed items periodically.
- Tire Pressure
- Wheel Lug Nuts
- Tire Rotation
- Windshield Wipers, Blades & Washer
- Fluid Leaks
- Doors & Engine Hood
- Lights
- Warning Lights & Buzzers
- Horn
- Windshield Glass
- Windshield Wipers & Washer
- Windshield Defroster
- Rear View Mirror
- Sun Visors
- Steering Wheel
- Seats & Seat Belts
- Accelerator Pedal
- Brake Pedal
- Brakes
- Parking Brake
- Automatic Transmission PARK Mechanism
- Windshield Washer Fluid
- Engine Coolant Level
- Radiator & Hoses
- Battery Electrolyte Level
- Brake Fluid Level
- Engine Drive Belts
- Engine Oil Level
- Power Steering Fluid
- Automatic Transmission Fluid Level
- Exhaust System
Factory Service Tools
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.