Why does the check engine light in my 420SEL 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 420SEL firing up its circuits. The light should turn off in a bit, but come see us if it doesn't.

Why does my Mercedes-Benz engine sound different?

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. Whistling could mean a belt is misaligned or there's an intake leak. 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 my Mercedes-Benz 420SEL engine?

Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' 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.

Can I put water in my Mercedes-Benz 420SEL radiator?

An emergency is the only time you should consider putting water in your radiator. Outside of that, it’s recommended you use a pre-mixed coolant or a 50/50 blend of water and coolant. However, if you need to continue driving your 420SEL when you’re out of coolant, having water in the coolant reservoir is better than nothing.

What could cause my 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 fixes Mercedes-Benz 420SEL engines?

Your local Firestone Complete Auto Care has you covered with expert 420SEL engine repair. Schedule an appointment today and see us at one of our thousands of locations.

Reliable Repairs for 1986 Mercedes-Benz 420SEL Engines

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1986 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

1986 Mercedes-Benz 420SEL Repair

Nothing lasts forever. Even your Mercedes-Benz 420SEL’s engine parts and components will change. We’re here to help when something stops working. Click on a repair below to learn more about 1986 Mercedes-Benz 420SEL repairs.

We Care for Mercedes-Benz 420SEL Engines

Mercedes-Benz 420SEL drivers trust that their 420SEL 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 the unexpected strikes, you may search the internet frantically for quick and affordable 1986 Mercedes-Benz 420SEL engine repairs. That's when it's time to head to Firestone Complete Auto Care. Since 1926, we’ve taken care of 500 million+ cars, so you can rest assured knowing your Mercedes-Benz 420SEL engine will be in good hands. If you think something’s wrong with your engine, schedule an appointment at your convenience. 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 1986 Mercedes-Benz 420SEL

An illuminated check engine light on your Mercedes-Benz 420SEL is one of the first signs it's time to 'brake' for engine service. A steady or flashing check engine light could signal a serious issue with your car’s starter, Causes may include a faulty oxygen sensor, damaged spark plug, a clogged 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 determine exactly why your check engine light is on. engine pinging noises, essential fluid leaks, or misfiring.

1986 420SEL Engine Services

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 don't start working until we have your approval. If a service can wait, we’ll make sure you know. But if immediate repairs are necessary for your safety, we’ll make sure that's clear, too. We want to provide you with the information you need to make an informed engine repair decision. Choose Firestone Complete Auto Care for Mercedes-Benz 420SEL engine repairs and you can feel confident knowing that we use Mercedes-Benz-approved parts and components like the serpentine belt, engine oil seal, ignition coil, or a different component.

Engine Q&A 1986 Mercedes-Benz 420SEL

Why does the check engine light in my 420SEL 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 420SEL firing up its circuits. The light should turn off in a bit, but come see us if it doesn't.
Why does my Mercedes-Benz engine sound different? 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. Whistling could mean a belt is misaligned or there's an intake leak. 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 my Mercedes-Benz 420SEL engine? Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' 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.
Can I put water in my Mercedes-Benz 420SEL radiator? An emergency is the only time you should consider putting water in your radiator. Outside of that, it’s recommended you use a pre-mixed coolant or a 50/50 blend of water and coolant. However, if you need to continue driving your 420SEL when you’re out of coolant, having water in the coolant reservoir is better than nothing.
What could cause my 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 fixes Mercedes-Benz 420SEL engines? Your local Firestone Complete Auto Care has you covered with expert 420SEL engine repair. Schedule an appointment today and see us at one of our thousands of locations.