2023 DEF concerns
Cargo Master
Joined: Apr 2021
Posts: 2,019
Likes: 752
From: Texas
As egr is not functioning.
it seems if egr is successful. Then def should be less..
as far as pids...off top of head
Log in yiur forscan to data logg and do the line by line to find what you need
Egt 11 iirc is 1st in line at the torpedo under the truck
I need to go look at mine
Laughing Gas
Joined: Sep 2023
Posts: 801
Likes: 543
From: NE Ohio
Def usage definitely goes up
As egr is not functioning.
it seems if egr is successful. Then def should be less..
as far as pids...off top of head
Log in yiur forscan to data logg and do the line by line to find what you need
Egt 11 iirc is 1st in line at the torpedo under the truck
I need to go look at mine
As egr is not functioning.
it seems if egr is successful. Then def should be less..
as far as pids...off top of head
Log in yiur forscan to data logg and do the line by line to find what you need
Egt 11 iirc is 1st in line at the torpedo under the truck
I need to go look at mine
Lead Driver
Joined: Nov 2005
Posts: 5,225
Likes: 4,239
From: Kaysville Utah
The 9th injector, injects fuel into the DPF to burn soot. DEF is used in the SCR to reduce NOx. Two different emissions
The 23+ trucks ( and especially the HO) run hotter than previous generation 6.7L engines. This extra heat in the combustion chamber produces more NOx and requires more DEF to remove it.
If you don't want to use as much DEF, watch your turbo boost and minimize how much boost you use and your NOx will be less and require less DEF to clean it.
The 23+ trucks ( and especially the HO) run hotter than previous generation 6.7L engines. This extra heat in the combustion chamber produces more NOx and requires more DEF to remove it.
If you don't want to use as much DEF, watch your turbo boost and minimize how much boost you use and your NOx will be less and require less DEF to clean it.
Lead Driver
Joined: Feb 2022
Posts: 7,968
Likes: 4,043
I get roughly 700 MPG of DEF with my speed being on average 60 MPH. My current Fuel economy since 660 miles when I reset the trips, 16.7. In 6117 miles I used 8.79 gallons of DEF. I am down to 24% and need to refill, so I can get my triple stats in which is more accurate.
One suggestion is to get a tail pipe emissions test done and compare it to what Ford would deem the average nominal reading. If the emissions sensors are out of whack, it will show up in an emissions test.
Also on a fully warmed engine, smell the exhaust, if you smell ammonia, it is definitely injecting too much urea.
One suggestion is to get a tail pipe emissions test done and compare it to what Ford would deem the average nominal reading. If the emissions sensors are out of whack, it will show up in an emissions test.
Also on a fully warmed engine, smell the exhaust, if you smell ammonia, it is definitely injecting too much urea.
Cross-Country
Joined: Jan 2022
Posts: 83
Likes: 26
Interesting. My 2024 F450 HO Lariat with 3500 miles dropped 30% of it's def towing our new 6000# trailer this last weekend about 300 miles.
Laughing Gas
Joined: Sep 2023
Posts: 801
Likes: 543
From: NE Ohio
5th Wheeling
Joined: Sep 2025
Posts: 37
Likes: 31
Nice rig. What is the GCW?
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