Trying to figure out the fault codes my 2011 Freightliner cascadia is throwing

uuu.. long list
#3 scr nox conversion efficiency low
#5 improper def quality
#6 dpf inlet pressure- not plausible
#7 def quality warning

 

#1 sub bus switch missing msf
#2 Relay group 3 -Voltage above normal, or shorted to high source
#4 Temperature sensor outside air, feedback - Data erratic, intermittent or incorrect

 

Your SCR module took a dump, bad nox sensor(s), or you're not getting DEF into the SCR module from the metering unit. I would need a log file to help you out if you're out of warranty.

 

I had the exact same thing i had to change the converter sensor which was and the def air pressure sensor. I also changed the harness and the air pressure valve. I had the exact same codes, it cose me over 4 grand. I also have a 2011 cascadia

 

Dont buy bulk def buy it from frieghtliner in jugs the pilot def screwed up my truck

 

Can someone please tell me why is all 3 lights flashing check engine,stop engine and regen light all at once everytime I try to regen it idle up pass 1500 rpm for bout 3 minutes then idle back down...PLEASE HELP

 

regen was interrupted I guess. no way to say what is causing regen to interrupt. could be many things

 

Ok well I finally got it towed to a freightliner dealership which I really didn't won't to do and they finally put it on the computer scanner and said my DOSER BLOCK and DOSER INJECTOR needs changing thats why it keeps interrupting the REGEN the cost will run $1600 freaking dollars Wooooow!!! parts n labor