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How to Reset the AdBlue Warning Light Without Diagnostic Tools

Model: Mercedes Vito MK 3, W447 - Years: 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
Part: AdBlue warning light

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Video tutorial

In this video, our YouTuber demonstrates a makeshift method to resolve the issue of the AdBlue sensor continuously reading a low level of AdBlue, even after refuelling, thus still displaying the error message "add AdBlue, low level". Essentially, urea crystallises and forms a seal around the edges, preventing the sensor from detecting the additive's addition.

This method - which involves blowing forcefully through a curved tube - is not a permanent solution, but it does allow the sensor to register that AdBlue has been added and turn off the warning light.


Updated on 3 October 2026 by ScegliAuto


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by ScegliAuto

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