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What Does the AdBlue Warning Light Indicate in the Audi A4 Avant and How to Reset It?

Model: Audi A4 B7 - Years 2004-2008
Part: AdBlue warning light

If the AdBlue warning light is on in your Audi A4 Avant, it means that the emissions fluid is at a too low level and needs to be refilled. To do this, you will need a 2.6-gallon container available at any auto parts store. Once you have it, ensure the vehicle is turned off, then open the fuel door and unscrew the small blue cap located on the right side. Next, insert the container's nozzle into the opening and pour in the necessary amount of fluid to reach the maximum level. To make the warning light go off, you may need to drive a few miles.

Updated on 27 August 2026 by ScegliAuto

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