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How to Reset the AdBlue Warning Light on the Audi A4?

Model: Audi A4 B9 - Years: 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
Part: AdBlue warning light

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Video tutorial

The AdBlue warning light that appears on the instrument cluster of the Audi A4 indicates that the amount of additive liquid in the designated tank is nearly depleted. To make the light disappear from the instrument cluster, you need to refill it: to do this, open the fuel door and unscrew the blue cap underneath.

Once this cap is removed, you can refill by pouring the necessary amount of additive liquid into the tank: this way, you can close the cap and check that the light has disappeared.


Updated on 2 November 2026 by ScegliAuto


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by ScegliAuto

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