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How to fix the AdBlue system malfunction in the Mercedes C-Class

Model: Mercedes Classe C W205 - Years: 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Part: AdBlue warning light

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Video tutorial

Today we will discover the instructions that will allow us to repair the fault in the AdBlue system of the Mercedes C-Class. First of all, we get on board the car and start the instrument panel; the onboard computer will tell us that ignition will not be possible due to the lack of AdBlue fluid refill.

Then we connect our diagnostic tool to check the real problem, which is usually caused by the NOX sensor; once we replace this sensor, we will verify that the error has been cleared by refilling the AdBlue fluid and resetting the warning light.


Posted on 24 October 2025 by ScegliAuto


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by ScegliAuto

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