DD15 low NOx conversion efficiency and bad DEF Quality

Could be the injector is dirty or faulty. I've had that.

 

I had tested the injector with the DEF Quantity, and it came out at 131mL, so it should be good? Right?

 

Sorry, meant the dozer injector and the dozer injector block. The injection rate you're seeing is fuel not def. The more fuel the higher the temp will go. Sometimes I've just replaced the dozer, this last time I've had to do the dozer injector and the HC doser. The dozer injector is behind the turbo in the exhaust. The HC block is on the other side of the motor (driver side near firewall).

The HC Dozer block controls the fuel going to that dozer injector. It possible that one or both of those are causing the problem.

When replacing the injector make sure you really clean out that hole with a screwdriver to loosen the carbon and long wire brush.
For the HC block you need several wrenches because it has fuel and coolant likes going to it.

 

Hello I had done some work on my 2016 freightliner that I just bought 25 days ago it's used truck with 498.000 miles can you please help me.

 

We can try but need some more info.

 

That was done on my truck and after all that repairs still didnt want to do the region all codes comeback again.
EEC3 SPN 5246 FMI 0.
They told me I will need new SCR BOX.
I just bought this truck 16 days ago .
It's a 2016 freightliner cascadia DD15 with 498.000 miles.

 

Prior to that repair I had to replace an sensor on the DPF they installed awning kit as well in the Sprigfield, Arkansas drove 300 miles a d this happened.