Fiat Ducato AdBlue Consumption & Warning Light Illuminated Below is a summary of the operation of the AdBlue system and how the indicators work. Basically, if the consumption (whole of life) is higher than about 9L/1000km, the AdBlue light will most likely be on all the time. There is no method to reset the whole of life consumption nor will the factory amend the inception point, (1500km) at this point in time. Big fibre glass body motorhomes are mostly affected, because of their size (wind resistance) and weight. It is not uncommon for vehicles here in Australia to experience consumption levels higher than 10L/1000km. For us, it is an education process for customers as to what to expect and how the system works. The biggest thing to remember is that the system is trying to predict when the tank will be low, and it is not reflecting the actual capacity of