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How to Reset the AdBlue Warning Light on the Mercedes GLS?

Model: Mercedes Gls X166 - Years: 2013, 2014, 2015, 2016, 2017, 2018, 2019
Part: AdBlue warning light

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Video tutorial

If the AdBlue warning light is on in the instrument cluster of your Mercedes GLS, it means that the fluid in the emissions system has reached the minimum level and needs to be topped up. This is a very simple and quick operation; let's see how to proceed in this tutorial.

First, purchase a 10-liter jug of urea from an auto parts store, then ensure the engine is off and open the fuel door.

Next, unscrew the blue cap, insert the supplied hose from the jug into the opening, and add the necessary amount of fluid to reach the maximum level.


Posted on 29 July 2026 by ScegliAuto


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Watch the video!


by ScegliAuto

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