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How to Refill AdBlue in 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

To refill AdBlue in the Mercedes A-Class, open the fuel filler door located on the left rear of the vehicle. Once the door is open, you will find a blue cap underneath.

Unscrew this cap to perform the refill: after the necessary amount of AdBlue has been added to the system, close the cap and the fuel filler door, ensuring everything is functioning properly.


Updated on 8 October 2026 by ScegliAuto


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by ScegliAuto

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