Nowadays the above-mentioned system, SCR, is installed in almost all modern trucks. Its functions are very similar to the functions of the passenger car catalyst.
Also the SCR system reduces the amount of harmful substances in exhaust gases. In case of failure those catalysts are usually removed from the passenger cars.
This solution is not suitable for trucks, as they often are used by large companies, and their exhaust gases are closely monitored by the governments to protect the environment.
AdBlue emulator solves 2 problems:
The second factor is definitely more important for the drivers and those who know how to count money. By abandoning the AdBlue fluid you can save about 5% of annual expenses for fuel consumption, and it is a huge amount for the vehicles with high mileage.
Nowadays there are lots of low-quality AdBlue liquids (urea) in the market. And since it is impossible to visually determine the quality of urea, there is a great risk that a fake liquid may get into the tank. And this liquid causes failure of metering module and other components of SCR system.