Why does the check engine light in my 420SEL turn on when I start my car?

It’s usually normal for your check engine light to turn on upon ignition. This is a sign that your vehicle is testing its circuits. The light should turn off in a bit, but come see us if it doesn't.

Are Mercedes-Benz 420SEL engine noises bad?

Strange under-the-hood noises can point to problems within your Mercedes-Benz 420SEL engine. Knocking or tapping could be a symptom of low oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.

What could damage my Mercedes-Benz 420SEL 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. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.

Can I add water to my Mercedes-Benz 420SEL radiator?

Only in emergencies. A 50/50 mix of coolant and water (or a pre-mixed) coolant is recommended. However, if you must keep driving when you're out of coolant, it's better to drive with water in your coolant reservoir than nothing.

What can cause a 420SEL engine to suddenly stop?

Your 420SEL car engine could stop suddenly due to low fuel, electrical issues, overheating, a faulty ignition system, mechanical troubles, or sensor problems.

Who can repair my Mercedes-Benz 420SEL engine?

For Mercedes-Benz 420SEL 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 1990 Mercedes-Benz 420SEL

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1990 Mercedes-Benz 420SEL Trim Options

Select your Mercedes-Benz 420SEL trim level to learn more about Mercedes-Benz-recommended engine repair. Use the following chart to find information.

V8/4.2L

Mercedes-Benz 420SEL Repairs and Services

Nothing stays the same forever. Even your Mercedes-Benz 420SEL's many parts and pieces. We’re here to help when something stops working. Click on a repair below to learn more about 1990 Mercedes-Benz 420SEL repairs.

We’re Trained to Care for Mercedes-Benz 420SEL Engines

The Mercedes-Benz 420SEL is respected for its reliability. You probably thought about that when you got it. However, even your trustworthy engine is subject to wear and tear. Things can go wrong on the road. If they do, you’ll have to find a dependable 1990 Mercedes-Benz service center — quick! That’s where Firestone Complete Auto Care comes in. We've serviced millions of vehicles since 1926, and our professional technicians are trained to service Mercedes-Benz 420SEL engines. Schedule an appointment if you're experiencing problems that could require engine repair. Firestone Complete Auto Care offers both trustworthy and affordable engine repairs.

Illuminated Check Engine Light on 1990 Mercedes-Benz 420SEL

As soon as your 420SEL check engine light turns on, it’s time to get an expert’s opinion. A check engine light that’s flashing or steadily illuminated could point to problems with your car’s ignition, Potential causes may include a faulty oxygen sensor, damaged spark plug, issues with your catalytic converter, or an engine vacuum leak, to name a few potential sources. Stop by your local Firestone Complete Auto Care to get your 420SEL issues diagnosed and we’ll figure out why that check engine light is giving you grief. Other signs it's time for Mercedes-Benz 420SEL engine service might include essential fluid leaks, or misfiring.

Mercedes-Benz 420SEL Engine Repair

When your Mercedes-Benz 420SEL engine needs repairs, our technicians will make sure you understand what’s going on before they start working on your engine. We never do any work without your sign-off. If a service can wait, we’ll make sure you know. If it's necessary for your safety, we'll make sure you understand that, too. We want to give you all the details you need to make an informed decision about your engine repairs. By choosing Firestone Complete Auto Care for 420SEL engine repairs and you can feel good knowing that we only use Mercedes-Benz-compliant replacement parts such as the timing chain or belt, oil gasket, sensors, or a different component.

Engine Q&A 1990 Mercedes-Benz 420SEL

Why does the check engine light in my 420SEL turn on when I start my car? It’s usually normal for your check engine light to turn on upon ignition. This is a sign that your vehicle is testing its circuits. The light should turn off in a bit, but come see us if it doesn't.
Are Mercedes-Benz 420SEL engine noises bad? Strange under-the-hood noises can point to problems within your Mercedes-Benz 420SEL engine. Knocking or tapping could be a symptom of low oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.
What could damage my Mercedes-Benz 420SEL 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. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.
Can I add water to my Mercedes-Benz 420SEL radiator? Only in emergencies. A 50/50 mix of coolant and water (or a pre-mixed) coolant is recommended. However, if you must keep driving when you're out of coolant, it's better to drive with water in your coolant reservoir than nothing.
What can cause a 420SEL engine to suddenly stop? Your 420SEL car engine could stop suddenly due to low fuel, electrical issues, overheating, a faulty ignition system, mechanical troubles, or sensor problems.
Who can repair my Mercedes-Benz 420SEL engine? For Mercedes-Benz 420SEL 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.