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How to Top Off AdBlue in an Audi A4

Model: Audi A4 B9 - Years 2014-2024
Part: AdBlue warning light

The filler neck for adding AdBlue is located next to the fuel filler. To perform this operation, open the flap and remove the fuel cap. At this point, unscrew the cap of the AdBlue tank using a cross wrench. Now take the container with your additive, position it high, and connect the end of the hose to the tank's filler neck. After a sufficient amount of AdBlue has flowed in, disconnect the hose and replace the caps on the AdBlue and fuel fillers.

Updated on 27 June 2026 by ScegliAuto

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