Why does my 420SEL’s check engine light come on when I start it?

Generally, your check engine light turning on upon ignition is not a bad thing. It’s just your 420SEL firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Are Mercedes-Benz 420SEL engine noises bad?

Strange engine sounds can be a sign something’s off in your Mercedes-Benz 420SEL. Tapping or knocking could mean you're low on oil. A high-pitched whistle could signal 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 a Mercedes-Benz engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your Mercedes-Benz 420SEL engine?

Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, 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 put water in 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 the engine in my 420SEL to suddenly stop?

If your 420SEL car engine suddenly stops, it could be due to overheating, low fuel, a faulty ignition system, sensor problems, electrical system trouble, or mechanical issues.

Where can I go for Mercedes-Benz 420SEL repair?

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 1989 Mercedes-Benz 420SEL

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1989 Mercedes-Benz 420SEL Trim Options

Select your Mercedes-Benz 420SEL trim level to learn more about Mercedes-Benz-recommended engine repair. Even Mercedes-Benz 420SEL parts will get older and change.

V8/4.2L

Mercedes-Benz 420SEL Repairs and Services

Nothing lasts forever. Even your Mercedes-Benz 420SEL's many parts and pieces. We’re here to help when something stops working. Select a repair or category to learn more about 1989 Mercedes-Benz 420SEL services.

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

The Mercedes-Benz 420SEL is respected for its reliability. You may have even been thinking about that when you bought it. Even so, pieces and parts can break down over time. Sometimes plans go sideways. If the unexpected strikes, you may search the internet frantically for quick and affordable 1989 Mercedes-Benz 420SEL engine repairs. 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 a courtesy inspection at the first sign of engine trouble. Firestone Complete Auto Care offers both trustworthy and affordable engine repairs.

My 1989 Mercedes-Benz 420SEL Check Engine Light Is On

If your 420SEL 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, Causes may include a faulty oxygen sensor, bad spark plug, a clogged catalytic converter, or a leak in the engine vacuum, but that's only a few of the possible causes. Bring your 420SEL in for an on-board diagnostic check and we'll determine exactly why your check engine light is on. Other signs your Mercedes-Benz 420SEL engine needs some TLC are oil leaks, or a sinking feeling that something’s wrong.

1989 420SEL Engine Services

If your 1989 420SEL 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 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 seek to give you all the info you need to make a smart decision about our services. Turn to Firestone Complete Auto Care for your 1989 420SEL engine repairs and you can drive easy knowing that we use Mercedes-Benz-approved parts and fluids — cambelt, valve guide seal, fuses, or other parts.

Questions About 1989 Mercedes-Benz 420SEL Engines

Why does my 420SEL’s check engine light come on when I start it? Generally, your check engine light turning on upon ignition is not a bad thing. It’s just your 420SEL firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Are Mercedes-Benz 420SEL engine noises bad? Strange engine sounds can be a sign something’s off in your Mercedes-Benz 420SEL. Tapping or knocking could mean you're low on oil. A high-pitched whistle could signal 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 a Mercedes-Benz engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your Mercedes-Benz 420SEL engine? Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, 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 put water in 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 the engine in my 420SEL to suddenly stop? If your 420SEL car engine suddenly stops, it could be due to overheating, low fuel, a faulty ignition system, sensor problems, electrical system trouble, or mechanical issues.
Where can I go for Mercedes-Benz 420SEL repair? 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.