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How AdBlue Works Chemically

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

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Associated with SCR technology, AdBlue transforms nitrogen oxides (NOx) emitted by diesel engines into nitrogen and water vapour, which are non-polluting components already present in the atmosphere. Let's see how it works in practice.

AdBlue is injected into the exhaust system upstream of the SCR catalyst. Under the effect of heat, urea decomposes, producing ammonia (NH3). Through a chemical reaction with ammonia, the nitrogen oxides (NOx) contained in the exhaust gases from the diesel engine are transformed into nitrogen (N2), an inert gas and the main component of the air we breathe, and water vapour (H2O). AdBlue and SCR are the winning combination for better air quality.


Updated on 14 July 2026 by ScegliAuto


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How to Remove the Toll Tag Holder from the Car Windscreen

The toll tag holder is usually attached to the car windscreen to ensure that the toll tag functions immediately when passing through barriers. However, if you decide to remove the holder, you should follow this procedure: - Insert the toll tag into the holder; - Pull the holder inwards to detach it from the windscreen; you can use a glass scraper or a stiff plastic card to assist you; After removing the holder, it is essential to remove the adhesive from the windscreen. To remove the adhesive, we recommend using a solvent-based spray that will remove the glue without clouding the area.

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