Why does the check engine light come on when I start my LS400?

Generally, your check engine light turning on upon ignition is not a bad thing. It’s just your LS400 firing up its circuits. The light should turn off in a bit, but come see us if it doesn't.

Why is my Lexus LS400 making engine noise?

Strange under-the-hood noises can point to problems within your Lexus LS400 engine. Knocking or tapping could be a symptom of low oil. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing may be caused by a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.

What could damage a Lexus engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your Lexus LS400 engine?

Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' flooring the gas pedal while the car is in Park, or accelerating too quickly, too soon. Steer clear of these habits to help protect engine performance and efficiency.

Can I add water to my Lexus LS400 radiator?

It’s not recommended you put water in your LS400 radiator unless it’s an emergency. Under normal circumstances, use a 50/50 mix of water and coolant or a pre-mixed coolant. But, if you need to keep driving while out of coolant, using water is better than driving with an empty coolant reservoir.

What could cause my LS400 engine to suddenly stop?

There are different reasons your LS400 vehicle engine could suddenly stop. You may be looking at a lack of fuel, faulty sensors, issues with the ignition system, engine overheating, electrical problems, or mechanical troubles.

Who can repair my Lexus LS400 engine?

For Lexus LS400 engine repair, trust your local Firestone Complete Auto Care. You can make an appointment today at any of our thousands of locations across the U.S.

Engine Repairs for Your 1991 Lexus LS400

Learn about

1991 Lexus LS400 Trim Options

Select your Lexus LS400 trim level to learn more about Lexus-recommended engine repair. Use the following chart to find information.

V8/4.0L

Lexus LS400 Repairs and Services

Nothing lasts forever. Even your Lexus LS400's many parts and pieces. We’re here to help when something stops working. Select a service or repair below to learn more about what we can do for your 1991 Lexus LS400.

We Care for Lexus LS400 Engines

Lexus LS400 drivers trust that their LS400 will take them near and far. That might be why you bought it in the first place. Even so, pieces and parts can break down over time. Things can go wrong on the road. If they do, you’ll have to find a dependable 1991 Lexus service center — quick! That's when it's time to head to Firestone Complete Auto Care. We've serviced more than 500 million vehicles since 1926, and our technicians know Lexus LS400 engines. Schedule a courtesy inspection at the first sign of engine trouble. After all, Firestone Complete Auto Care is one of the most popular picks for professional engine repairs thanks to its service and affordability.

Check Engine Light on 1991 Lexus LS400

If your LS400 check engine light is on, it’s time to get it looked at. A check engine light that’s on or flashing could be a symptom of a serious problem in your car’s starter, Possible causes can include a failing oxygen sensor, worn spark plug, a problem with your catalytic converter, or a leak in the engine vacuum, to name a few possible causes. Bring your LS400 to Firestone Complete Auto Care to get computerized diagnostics and we’ll figure out why that check engine light is giving you grief. engine pinging noises, oil leaks, or engine misfiring.

1991 LS400 Engine Services

When your Lexus LS400 engine needs repairs, our technicians will make sure you understand what’s going on before they start working on your engine. We don't start working until we have your approval. If a repair can wait, we'll let you know. We'll also tell you if it's necessary for your safety. We seek to give you all the info you need to make a smart decision about our services. Choose Firestone Complete Auto Care for Lexus LS400 engine repairs and you can feel confident knowing that we use Lexus-approved parts and components like the timing chain or belt, oil gasket, ignition coil, or other parts.

Questions About 1991 Lexus LS400 Engines

Why does the check engine light come on when I start my LS400? Generally, your check engine light turning on upon ignition is not a bad thing. It’s just your LS400 firing up its circuits. The light should turn off in a bit, but come see us if it doesn't.
Why is my Lexus LS400 making engine noise? Strange under-the-hood noises can point to problems within your Lexus LS400 engine. Knocking or tapping could be a symptom of low oil. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing may be caused by a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.
What could damage a Lexus engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your Lexus LS400 engine? Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' flooring the gas pedal while the car is in Park, or accelerating too quickly, too soon. Steer clear of these habits to help protect engine performance and efficiency.
Can I add water to my Lexus LS400 radiator? It’s not recommended you put water in your LS400 radiator unless it’s an emergency. Under normal circumstances, use a 50/50 mix of water and coolant or a pre-mixed coolant. But, if you need to keep driving while out of coolant, using water is better than driving with an empty coolant reservoir.
What could cause my LS400 engine to suddenly stop? There are different reasons your LS400 vehicle engine could suddenly stop. You may be looking at a lack of fuel, faulty sensors, issues with the ignition system, engine overheating, electrical problems, or mechanical troubles.
Who can repair my Lexus LS400 engine? For Lexus LS400 engine repair, trust your local Firestone Complete Auto Care. You can make an appointment today at any of our thousands of locations across the U.S.