Lexus GS400 Workshop Manuals and Repair Manuals

To change the cabin air filter in your Lexus GS400, locate the cabin air filter housing, which is usually located behind the glove compartment. Remove the screws or clips securing the housing, then open it to access the old filter. Take note of the filter orientation, remove the old filter, and replace it with a new filter of the same size and orientation. Close the housing, secure it with screws or clips, and ensure proper fitment.

To check the coolant level in your Lexus GS400, ensure the engine is cool and the vehicle is parked on a level surface. Locate the coolant reservoir, usually a translucent plastic container near the radiator, and check the level against the "Full" and "Low" marks. If the coolant level is below the "Low" mark, add a mixture of coolant and distilled water as specified in the owner's manual until it reaches the appropriate level.

To check the power steering fluid level in your Lexus GS400, locate the power steering fluid reservoir, generally near the engine. Remove the cap and wipe the dipstick clean. Reinsert it fully, remove it again, and check the fluid level against the "Full" and "Low" marks. If the fluid level is below the "Low" mark, add the recommended power steering fluid until it reaches the appropriate level. Be cautious not to overfill.

To check the transmission fluid level in your Lexus GS400, park the vehicle on a level surface and engage the parking brake. Start the engine and let it idle for a few minutes. Locate the transmission dipstick, usually near the back of the engine compartment, and pull it out. Wipe it clean, reinsert it fully, and then remove it again to check the fluid level. The correct fluid level should be between the "Hot" and "Cold" marks on the dipstick.

To jump-start your Lexus GS400, you will need a set of jumper cables and another vehicle with a fully charged battery. Position the vehicles so their batteries are close enough for the jumper cables to reach. Turn off both vehicles, connect the positive (+) cable to the positive terminal of the dead battery, then connect the other positive (+) cable to the positive terminal of the charged battery. Connect the negative (-) cable to the negative terminal of the charged battery, and the other end to a metal, unpainted part of the dead vehicle's engine. Start the engine of the vehicle with the charged battery, then start the Lexus GS400. Once the vehicle is running, carefully disconnect the jumper cables in the reverse order.

To replace a burnt-out headlight bulb in your Lexus GS400, open the hood and locate the back of the headlight assembly. Unplug the electrical connector from the bulb, then twist and remove the bulb from the assembly. Install the new bulb by twisting it into place, ensuring a secure fit. Finally, reconnect the electrical connector and test the headlight to ensure proper operation.

To replace a malfunctioning power window switch in your Lexus GS400, carefully pry up the switch bezel using a trim removal tool or a flathead screwdriver. Disconnect the electrical connector from the back of the switch and remove any retaining screws or clips securing the switch in place. Install the new switch by reversing the removal steps, ensuring proper alignment and connection. Test the power window operation to confirm proper functionality.

To reset the maintenance light in your Lexus GS400, turn the ignition switch to the "ON" position without starting the engine. Fully depress the accelerator pedal three times within 10 seconds. The maintenance light should flash and then turn off, indicating that the reset procedure was successful. This procedure may vary slightly depending on the model year, so it is advisable to consult the owner's manual for specific instructions.

It is recommended to change the engine oil in your Lexus GS400 every 5,000 to 7,500 miles or every 6 months, whichever comes first. Regular oil changes help maintain the performance and longevity of the engine by lubricating its internal components and preventing excessive wear and tear. Neglecting oil changes can lead to decreased engine performance and potential engine damage.

It is recommended to check the tire pressure in your Lexus GS400 at least once a month. Proper tire pressure is essential for optimal handling, fuel efficiency, and tire longevity. Underinflated or overinflated tires can lead to poor traction, uneven tire wear, and increased risk of a blowout, so regular pressure checks are crucial.

The air filter in your Lexus GS400 should be replaced every 15,000 to 30,000 miles, depending on driving conditions and air quality. A clogged or dirty air filter can restrict airflow to the engine, leading to reduced fuel efficiency and decreased engine performance. Regularly inspecting and replacing the air filter will help maintain proper engine function.

The brake pads on your Lexus GS400 should be replaced when the pad thickness is worn down to approximately 2-3 millimeters. However, the replacement interval can vary depending on driving habits, road conditions, and pad material. It is recommended to visually inspect the brake pads regularly and have them checked during routine maintenance to ensure safe braking performance.

The spark plugs in your Lexus GS400 should be replaced every 60,000 to 100,000 miles, depending on the type of spark plugs used. Worn or fouled spark plugs can cause misfires, reduced fuel efficiency, and engine performance issues. Regularly replacing the spark plugs will help maintain optimal combustion and prevent potential engine problems.

Your Lexus GS400 is designed to run on unleaded gasoline with an octane rating of 91 or higher. Using fuel with a lower octane rating may result in knocking or pinging noises, reduced engine performance, and increased emissions. It is important to use the recommended fuel to ensure optimal engine performance and fuel efficiency.

The timing belt in your Lexus GS400 should be replaced at the manufacturer-recommended interval, which is typically around 90,000 to 100,000 miles. The timing belt plays a crucial role in synchronizing the engine's internal components, and failure to replace it can result in serious engine damage. It is crucial to adhere to the recommended replacement interval to avoid costly repairs.