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Ask the Mercedes Expert: What if My Check Engine Light Comes On?

Updated: Jan 13, 2019

Everyone hates it when the "check engine" light appears on their dashboard. After all, what does it really mean? There are so many things that could lead to a "check engine" light that you may not know whether you need to panic or whether there are issues that you can check yourself.

But while a check engine light can mean a large number of things, there are some issues that are more common than others. Here are a few of the most common problems that can lead to a check engine light -- in addition to how serious they are. If you're experiencing any of these problems, you can get them addressed today at Eurotech Complete Auto Care.

5 Common Reasons Your Mercedes-Benz Check Engine Light Is On

While there are many reasons a Mercedes-Benz can display a check engine light, most of them will get worse over time and need servicing. Thus, just the engine light alone is often enough to merit a visit to a Mercedes Service and Parts center. Here's an overview of which Mercedes parts you may need to repair or replace.

1. Your Catalytic Converter

A catalytic converter is intended to reduce emissions from your vehicle's exhaust. As carbon monoxide and other gasses are spelled from the vehicle, the catalytic converter changes them into other, less toxic chemicals. If a catalytic converter ceases to function, then a vehicle may not be able to pass an emissions test. It will need to be taken to a Mercedes Repair center to begin operating as it should.

2. Your Spark Plugs and Wires

Spark plugs often cause issues with your engine starting, idling, or misfiring. Though they are simple, spark plugs (and the attached wires) are what help control your engine. Luckily, they can be easily replaced by any Mercedes-Benz service center. You can contact Eurotech Complete Auto Care to get them tested and replaced today. It's common that a vehicle will need to get their spark plugs replaced periodically.

3. Your Mass Airflow Sensor

How does your car tell how much fuel it needs? With your mass airflow sensor. Your mass airflow sensor is going to detect the air that is going through the engine, which in turn impacts how much fuel the vehicle needs. If your mass airflow sensor isn't working, then your vehicle isn't going to be as efficient as it can be. Taking it to a Mercedes-Benz silicon valley service center will help you reduce your fuel consumption.

4. Your Gas Cap

It may seem strange, but your gas gap could also cause your check engine light to come on. Before you head over to Mercedes-Benz San Francisco or your local repair and collision center, check to make sure your gas cap has been properly affixed. If it's a little loose, it's possible that your engine could think that it is under-pressured or that fuel is leaking.

Of course, many modern Mercedes-Benz vehicles also have a gas cap light, intended to indicate to you when your gas cap has been left off. But if your gas cap is broken in some way, the check engine light may be triggered while the gas cap light is not. If your gas cap is damaged or leaking, you can buy another one at a Mercedes body shop or repair shop, like Eurotech Complete Auto Care.

5. Your Oxygen Sensor

An oxygen sensor determines how much oxygen remains unburned within the vehicle's exhaust system. This is an essential method of measuring fuel efficiency and making sure that the vehicle isn't experiencing high emissions or decreased mileage. However, the sensor doesn't have to be damaged to malfunction: sometimes, it's just dirty. Eurotech Complete Auto Care can clean the sensors of Mercedes SF Bay Area vehicles to keep them operating effectively.

Many things can trigger a Mercedes-Benz Check Engine Light, and while they may vary in security none of them should ever be ignored. Over time, many of these problems can become more significant, costing more money and time to fix. If your check engine light is currently on, you can contact Eurotech Complete Auto Care to identify and repair the problems.

For more information visit Eurotech Complete Auto Care for the best of the best for your Mercedes-Benz repair, facilities and complete auto care needs or make an appointment at

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