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How to Reset the B1 Service on a Mercedes CLA

Model: Mercedes Classe C W205 - Years 2014-2021
Part: Warning light – error code

To reset the B1 service on the Mercedes CLA (or any Mercedes C-Class), first, get in the vehicle and close all four doors. Then, insert the key and turn it to position 1, which powers on the instrument cluster. Now, press the "call" button and then the "OK" button. Hold both buttons down simultaneously until the "Assyst plus" message appears. Now press "OK". It will show "full service" under "service data". Confirm with "OK". Now scroll down to "full service" and confirm again with "OK". It will ask for the type of oil you have used; select it and confirm, which will take you back to "service data". Press "OK". Now it will indicate that there are 365 days until the next service!

Updated on 17 August 2026 by ScegliAuto

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