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Merceddes-Benz E 350 Check Engine Light Meanings

Your Mercedes-Benz E 350's Check Engine Light is responsible for calling out any malfunctions with your vehicle. Also known as a malfunction indicator lamp, it lets drivers know that there is an issue with the vehicle's emissions system. In the event emissions increase past a threshold amount, the Check Engine light turns on.

Consider your emission control system's health the greatest indicator of your vehicle's engine, emissions, or transmission system health.

Once your Check Engine light turns on, it will store a diagnostic trouble code (DTC) to your vehicle's computer. You use the DTC to diagnose the issue correctly. These trouble codes can range across all types of problems.

Keep reading to learn more about Mercedes-Benz E 350, check engine light common causes, how to reset check engine light Mercedes-Benz E 350, and common areas to troubleshoot when a check engine light comes on.


Where Is My Mercedes-Benz E 350 's Check Engine Light Location?

Your Check Engine Light is in your instrument cluster. It can be orange, yellow, or amber and is shaped like a motor. A steady light is indicative of a smaller issue, and a rapidly flashing Check Engine Light needs immediate attention, requiring you to pull the vehicle over.

Steady Check Engine Light indicates a wide range of monitor issues, such as a loose gas cap, loose oil fill cap, or a defective exhaust oxygen sensor causing poor fuel economy. It can also reveal steering problems, such as low power steering fluid levels that result in sluggish acceleration and harder turns of the steering wheel due to a lack of hydraulic activity.


What Issues Can Trigger Your Mercedes-Benz E 350 Check Engine Light to Turn On?

Here are some common issues triggered by your Mercedes-Benz E 350's Check Engine Light.


Defective Thermostat

Your thermostat is responsible for preventing your vehicle from overheating and regulating its temperature. A Check Light Engine light can indicate your engine is overheating due to old coolant. If your coolant is not changed regularly, it can corrode your engine and cause overheating. You can buy a replacement thermostat here on our site.


Spark Plug Issue

Spark plugs play a direct role in engine combustion, ensuring an optimal air-to-fuel ratio based on driving conditions. Any issues with the spark plugs or wires can result in lower fuel economy, failure to start, or engine misfires. You can buy replacement spark plugs here on our site.


Defective Oxygen Sensor

Oxygen sensors help with engine efficiency by optimizing unburned oxygen in your exhaust system to produce the appropriate fuel mixture. The better the fuel mixture, the better the ratio of fuel to air, which maintains a healthy fuel economy and power. Any issue with your faulty oxygen sensor will result in poor readings to your vehicle computer and worsening fuel economy by as much as 40 percent. Faulty oxygen sensors are one of the most common reasons for Check Engine Lights turning on, right next to loose gas caps. 


How Do I Figure Out What the Issue Is?

Your vehicle's OBD-II port offers a direct connection to your vehicle's computer. Simply plug an OBD-II scanner, and a diagnostic code will reveal what the issue is using a series of numbers. You can also use an adapter to plug a wireless device. After plugging in the OBD-II scanner, expect some prompts that will ask for vehicle make and model and Vehicle Identification Number (VIN).

This tool also allows you to reset the internal code and shut off the warning light.


How Do I Reset Check Engine Light Mercedes-Benz E 350?

Please follow the instructions below to reset your Check Engine Light. For this task, you will need an OBD-II scanner.

  1. Resetting your Check Engine Light is a very straightforward process. For this task, you will need an OBD-II scanner.
  2. Locate your ODB connector (under the steering wheel) and turn on your vehicle's ignition.
  3. Plug in your OBD-II scanner.
  4. Run a scan and jot down all error codes.
  5. Troubleshoot and fix the issue at hand
  6. Press the 'Clear' button to remove the error from the system.
  7. Turn off the ignition and turn it back on, checking to see if the warning light continues to display. 

Note, we highly recommend getting to the root cause of any issue before resetting the Check Engine Light. Resetting the code does not eliminate the problem by any means.

All in all, your Mercedes-Benz E 350's Check Engine Light is an integral part of your vehicle's operation, allowing you to quickly identify thousands of malfunctions. Be sure to take the proper precautions in resetting your Check Engine Light until after you fully investigate the malfunction.