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What is AdBlue and how do you refill it in the vehicle's tank?

Model: (Various brands) Various
Part: AdBlue warning light

Video tutorial

AdBlue is an additive composed of an aqueous solution of urea that, through chemical reduction, transforms nitrogen oxides into nitrogen and water. This additive is used exclusively in cars equipped with diesel engines and serves to reduce emissions of nitrogen oxides from the exhaust gas. Due to the requirement of its use in cars with diesel engines, the additive can be found at gas stations or online.

Its cost is around 10€ to 16€. To refill the liquid in the tank, we must open the diesel tank door and unscrew the blue cap. Pour the liquid into the tank and once finished, close the cap and the door.


Posted on 28 March 2025 by ScegliAuto


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    Frequently Asked Questions

    • Vari - How much does it cost to replace the AdBlue tank? Read answer

How to Open the Fuel Flap on a Volkswagen Tiguan?

To open the fuel flap on a Volkswagen Tiguan, first unlock the car using the appropriate button on the remote. This will open the car and unlock the mechanism that controls the fuel flap. At this point, apply light pressure to the left side of the flap to open it and access the cap underneath. Once this is unscrewed, you can refuel and then close everything.

Watch the video!


by ScegliAuto

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