Judging by previous posts thes vehicles appear to be a headache.
The three codes appear to relate to separate faults. The most puzzling for me is; P1445 Additive system Quantity too high. Live data appears to show that the tank is not overfilled. Other threads have indicated that the ECU that controls the additive injection may be defective.
Normally I wouldn't ask for help without doing a lot more homework, but to be honest, I'm not quite sure where to start with this one.