How to Reset Service Light on 2019 Mercedes A-Class: Your Fast-Track Guide to Quick Resets

Resetting the service light on your 2019 Mercedes A-Class is a straightforward process if you follow the correct steps. This indicator is designed to remind you of regular maintenance like oil changes or inspections. To reset it manually (without special diagnostic tools), follow these instructions:

1. Get in your car and close all the doors.
2. Turn the ignition key to position one (do not start the engine). If your vehicle features a Start/Stop button, press it twice without pressing the brake pedal.
3. On the steering wheel, locate the phone (call) button and the “OK” button on the left side. Hold both buttons down together for several seconds.
4. Your dashboard display will enter the “Vehicle Data” menu. Use the up/down arrows to navigate to “Assyst Plus” or “Service Menu.”
5. Use “OK” to select “Full Service,” then scroll to and confirm “Service Confirmed” or “Reset Service.”
6. Follow any on-screen prompts to confirm the reset. Once completed, the service light should turn off.

Always verify the reset was successful by turning off then on again the ignition, making sure the light no longer appears. If the indicator remains, repeat the steps or consult your vehicle’s owner’s manual.

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Tips 1:

Always keep a record of your service intervals and reset dates. Digital logs are helpful for resale value and ongoing vehicle health tracking. Also, be gentle and deliberate with the dashboard buttons to ensure you don’t inadvertently access the wrong menu.

FAQ

Q: Can I reset the service light after changing oil only?

A: Yes, you can reset the service light after completing any of the required maintenance tasks, such as an oil change.

Q: Will resetting the service light void my warranty?

A: No, resetting the light simply tells your car’s computer that service has been completed. Ensure all recommended maintenance is actually performed.

Q: What if my service light won’t reset following these steps?

A: If repeated attempts don’t work, consult your owner’s manual or visit an authorized Mercedes center, as some models may require specialized diagnostic tools.

Q: How often should I perform service to avoid frequent warnings?

A: Follow the service interval recommendations in your owner’s manual, usually every 10,000 miles or 12 months, whichever comes first.

Q: Can I reset the light with an OBD-II scanner?

A: Yes, certain OBD-II scanners compatible with Mercedes vehicles can reset the service indicator if the manual method does not work.