How do I reset the service light on my Mercedes-Benz C-Class W205 (2014-2021)?

Resetting the service light on a Mercedes-Benz C-Class W205 (2014-2021) can be done easily following a few specific steps. Below is a detailed guide that includes symptoms, diagnostic steps, tools required, and repair instructions.

Symptoms

• Service light (also called the Maintenance or Service Reminder light) illuminated on the dashboard.
• Notifications on the display indicating upcoming service or maintenance intervals.

Tools Required

• None. This procedure can be completed using the vehicle's ignition and control buttons.

Diagnostic Steps

Before resetting the service light, confirm that the required maintenance has been performed. This typically includes an oil change, filter change, or other scheduled services.

Resetting the Service Light on a Mercedes-Benz C-Class W205

Step 1: Prepare the Vehicle

1. Ensure the Vehicle is in Park (P): Make sure the vehicle is parked and the engine is off.
2. Close All Doors: Ensure all doors are closed for accurate sensor readings.

Step 2: Turn on the Ignition

1. Insert the Key: Insert the key fob into the ignition slot.
2. Turn the Ignition On: Press the Start/Stop button without pressing the brake pedal (if equipped with keyless ignition) or turn the key to the "On" position. This should activate the vehicle's electrical systems without starting the engine.

Step 3: Access the Instrument Cluster Menu

1. Navigate to the Trip Reset Button: Locate the trip odometer reset button on the instrument cluster.
2. Press the Trip Reset Button: Press and hold the trip reset button until the instrument cluster display shows the menu options.

Step 4: Locate the Service Menu

1. Use the Steering Wheel Controls: Use the left or right arrow buttons on the steering wheel to navigate through the menu options.
2. Select "Service": Find and select the "Service" option. This may also be labeled as "Assyst Plus" depending on your model.

Step 5: Reset the Service Light

1. Select "Confirm Service": Once in the service menu, navigate to the option that allows you to confirm the service.
2. Press and Hold the Trip Reset Button: When prompted, press and hold the trip reset button until the display shows a confirmation message indicating that the service light has been reset.

Step 6: Verify the Reset

1. Turn Off the Ignition: Turn off the vehicle's ignition completely.
2. Start the Vehicle: Start the engine and check the instrument cluster to ensure that the service light is no longer illuminated.

Conclusion

Following these steps should reset the service light on your Mercedes-Benz C-Class W205. If the light remains on after following the above steps, it may indicate that there are other issues that need to be addressed, such as a fault code or an incomplete service procedure. If necessary, consult a professional technician or utilize a diagnostic scanner for further troubleshooting.