2012 Cascadia with 280K Multiple fault codes Please Advise

Truck has been at Freightliner since Thursday. They called this morning and said they have to replace the DEF pump and DEF pressure regulator. I am real curious about this now because I know the truck has been using DEF. I will not get truck back until next week. Monday is a holiday so maybe Tuesday or Wednesday. It is all covered under warranty. My cruise control powered up before I took it in but I could not set it. I hope by them clearing the codes that it will set when it is all done. Time will tell.
D Rock

 

I want to add this to my thread since we are talking about the DEF system and codes related to it. Here are two part numbers and a diagram I got from someone on another thread that I thanked. I put the cost of the parts for my area in Chesapeake, VA.
I do not have the part number for the air screen for incoming air to the DEF pump. I think it is part number 90 in the picture
DDE A0001420289 is the def filter Part 20
DDEA0001400694 is the DEF incoming filter screen part 80
Def filter is 38.98$
Def incoming filter screen is 6.62$ in Chesapeake, VA at Freightliner. Def filter from fleet supply store is 27$ but have to wait 2 weeks for delivery. I need to start a freightliner parts thread. Thank you sir.

 

I get my truck back thursday morning. I know they replaced the DEF pump and pressure regulator. They also performed a forced Regeneration. All under warranty. I hope the cruise works now. If not I will start a new thread for that.

 

I went to pick up my truck from freightliner dealer Thursday morning, 9-8-16. They replaced DEF pump new, Pump air pressure regulator new that reduces truck pressure from over 100-130 down to 80 psi and new dosing valve unit. They said they did a forced regen. Truck still had 3 active fault codes I brought it in there with and yellow blinking light above DEF level indicator (which means Regulatory Fault Ignored by the driver for a long time)
I went right back in and ripped into the service manager's a55. A tech performed another forced regen and cleared all codes and the regulatory fault ignored light. I have driven the truck 900 miles since then on Thursday and Friday. I filled up on Thursday evening on fuel and DEF. I drove 648 miles. I refilled fuel(98 gallons) and DEF( 5.5 Gallons) at the end of the 648 mile trip. I am getting about 6.5 MPG on fuel and 117.8 MPG on DEF. Leg miles for trip are 131 miles at 76K pounds gross. 200 miles with empty new 53 foot van. 217 miles at 55k pounds gross. Hwy 58 at 60MPH for 160 miles total and I-95 fairly flat between Emporia, VA at exit 11 down to Timmonsville, SC exit 153 averaging 65MPH
It seem like it is using a lot of DEF and much lower MPG for fuel. It is my first nice truck but also my first truck with EGR and After treatment system. Please Advise.

 

Right at 1100 miles or so I got 3 codes again.
EEC 061 SPN 004364
NOX CONV EFF 01

EEC 061 SPN 004364
NOX CONV EFF 18

EEC 061 SPN003364
DEF QUALITY 02

I have driven about 700 Miles since these came in. The DEF QUALITY code is no longer active. Only the NOX CONV EFF codes are still active. The small yellow blinking light above the DEF level indicator only blinked for about 300 miles. I think the light means "Regulatory fault Ignored" Any thoughts??????? Remember still under warranty but every day I don't work I lose 300-500$/day.