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How to reset the AdBlue warning light on the Mercedes M-Class?

Model: Mercedes Classe M W166 - Years: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
Part: AdBlue warning light

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Video tutorial

To reset the AdBlue warning light on the Mercedes M-Class, you need to top up by adding the necessary amount of additive liquid into the designated tank: to do this, open the fuel flap located at the rear right of the vehicle. Once opened, you will find the blue cap underneath, which must be unscrewed: this will allow you to insert the required amount of AdBlue liquid into the tank.

After this, you can turn on the ignition to check that the warning light is off.


Updated on 19 September 2026 by ScegliAuto


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by ScegliAuto

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