Why does the check engine light in my S400 turn on when I start my car?

It's okay if your check engine light comes on when you first start your vehicle. It’s just your S400 firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Why is my Mercedes-Benz S400 making engine noise?

Strange engine sounds can be a sign something’s off in your Mercedes-Benz S400. Tapping or knocking could mean you're low on oil. Whistling sounds could mean you have 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 Mercedes-Benz engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your Mercedes-Benz S400 engine?

Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, revving your engine while the vehicle is in Park, or slamming the gas pedal while the engine is still cold. Steer clear of these habits to help protect engine performance and efficiency.

Is it okay to put water in my Mercedes-Benz S400 radiator?

It’s not recommended you put water in your S400 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 can cause a S400 engine to suddenly stop?

If your S400 car engine suddenly stops, it could be due to overheating, low fuel, a faulty ignition system, sensor problems, electrical system trouble, or mechanical issues.

Who repairs Mercedes-Benz S400 engines?

Your local Firestone Complete Auto Care fixes Mercedes-Benz S400 engines. Book an appointment today! We have thousands of locations across the country.

Engine Repairs for Your 2012 Mercedes-Benz S400

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2012 Mercedes-Benz S400 Trim Options

Select your Mercedes-Benz S400 trim level to learn more about Mercedes-Benz-recommended engine repair. Use the following chart to find information.

V6/3.5L

Repairs for Your 2012 Mercedes-Benz S400

Stuff wears out. Even your Mercedes-Benz S400’s engine parts and components will change. When something breaks, we're ready. Select a service or repair below to learn more about what we can do for your 2012 Mercedes-Benz S400.

We Care for Mercedes-Benz S400 Engines

The Mercedes-Benz S400 is respected for its reliability. You probably thought about that when you got it. 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 2012 Mercedes-Benz service center — quick! Luckily, you won’t have to look far, since Firestone Complete Auto Care has 1,700+ locations across the country. Since 1926, we’ve taken care of 500 million+ cars, so you can rest assured knowing your Mercedes-Benz S400 engine will be in good hands. Schedule an appointment if you're experiencing problems that could require engine repair. Firestone Complete Auto Care is a top choice for professional engine diagnosis, service, and repair at an affordable price.

Check Engine Light on 2012 Mercedes-Benz S400

An illuminated check engine light on your Mercedes-Benz S400 is one of the first signs it's time to 'brake' for engine service. A check engine light that’s on or flashing could be a symptom of a serious problem in your or emission control system that won’t go away on its own. Causes may include a faulty oxygen sensor, damaged spark plug, issues with your catalytic converter, or an engine vacuum leak, to name a few possible causes. Bring your S400 to Firestone Complete Auto Care to get computerized diagnostics and our expert techs will get the root of the problem. rattling sounds, oil leaks, or misfiring.

Mercedes-Benz S400 Engine Repair

If your 2012 S400 engine needs repairs, our technicians will provide you with a thorough explanation beforehand. We never do any work without your sign-off. If a repair isn’t urgent right now, we’ll let you know. We'll also tell you if it's necessary for your safety. We want to give you all the details you need to make an informed decision about your engine repairs. Choose Firestone Complete Auto Care for Mercedes-Benz S400 engine repairs and you can feel confident knowing that we use Mercedes-Benz-approved parts and components like the timing belt, engine oil seal, fuses, or another part.

Engine Q&A 2012 Mercedes-Benz S400

Why does the check engine light in my S400 turn on when I start my car? It's okay if your check engine light comes on when you first start your vehicle. It’s just your S400 firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Why is my Mercedes-Benz S400 making engine noise? Strange engine sounds can be a sign something’s off in your Mercedes-Benz S400. Tapping or knocking could mean you're low on oil. Whistling sounds could mean you have 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 Mercedes-Benz engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your Mercedes-Benz S400 engine? Certain driving habits can hurt your engine. These habits include driving on an empty fuel tank, revving your engine while the vehicle is in Park, or slamming the gas pedal while the engine is still cold. Steer clear of these habits to help protect engine performance and efficiency.
Is it okay to put water in my Mercedes-Benz S400 radiator? It’s not recommended you put water in your S400 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 can cause a S400 engine to suddenly stop? If your S400 car engine suddenly stops, it could be due to overheating, low fuel, a faulty ignition system, sensor problems, electrical system trouble, or mechanical issues.
Who repairs Mercedes-Benz S400 engines? Your local Firestone Complete Auto Care fixes Mercedes-Benz S400 engines. Book an appointment today! We have thousands of locations across the country.