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How do you reset the AdBlue warning light on the Mercedes A-Class?

Model: Mercedes Classe A W177 - Years: 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: AdBlue warning light

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Video tutorial

The AdBlue warning light on the Mercedes Class A can be completely turned off by opening the fuel flap of the car, allowing you to locate the blue cap next to the fuel cap. Once this blue cap is removed, it will be possible to add the necessary amount of fluid into the tank to fill it up. After the refill is complete, you need to close the cap and also the fuel flap: once it has been closed, you should turn on the ignition to check that the warning light has disappeared.


Posted on 30 November 2025 by ScegliAuto


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