Hi, my mechanic is an older diesel engine mechanic and isn't too familiar with the newer Hino trucks and I currently have a 2008, 2011, and 2016 Hino 338. I currently just had a few codes(P204F and P20E8) that came up and after reading through some of the forums I found the answers I needed my mechanic is just not familiar with these new DEF systems. I was curious if there was a printout diagram for the DEF system to point him in the right direction(these codes came up on the 2011 Hino 338). I am trying to do more preventative maintenance on the trucks to avoid having to lose the truck for weeks at the dealer. Any information would be helpful. Thank you.