ADBLUE OFF

Adblue is an aqueous chemical solution consisting of a mixture of demineralized water and urea in 32.5% of nominal concentration. This specialized liquid is used in the systems of selective catalytic reduction (SCR) that incorporate diesel vehicles, specifically, and its purpose is to reduce NOx levels.
The Adblue, also known as DEF (Diesel Exhaust Fluid), is introduced into the exhaust system just before the SCR catalyst. There, it comes into contact with its gases, which generates a chemical reaction that results in NOx becoming nitrogen and water vapor.