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How to Reset the "Maintenance B" Message on a Mercedes A-Class?

Model: Mercedes Classe A W177 - Years: 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: Warning light – error code

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Video tutorial

To reset the "Maintenance B" message on a Mercedes A-Class, insert the key and turn it to position 1. Now, press and hold the OK button and the button with the phone icon for about three seconds: a menu with four options will appear. In this menu, select the last option, ASSYST PLUS, by pressing the OK button on the steering wheel.

In the next menu, select "Maintenance 1/2/3" based on how many services have already been performed. After doing this, select "Confirm maintenance," then press "Yes" and finally "Confirm." At this point, the "Maintenance B" message will have been successfully reset.


Updated on 6 May 2026 by ScegliAuto


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by ScegliAuto

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