HELP!! Engine 2 SPN 102 FMI 18 on a DD15

Lord have mercy!! I have had nothing but issues with this code continuing to pop up!!

Engine 2 SPN 102 FMI 18
Air Intake System Problem Detected
25% Derate

2016 FL Cascadia DD15 13 spd and it’s still under warranty. I’ve lost count on how many times it’s been to the dealership with this same issue. They told me it was my DOC. They told me to drive min 1550-1650 rpms. I’ve done this and yet it still comes on. I recently replaced my DPF. What am I doing wrong? I’ve done what they told me to do.

I’m not 500 miles then the engine light comes on, then not too much later that same code pops up!!!
How is it that the different FL dealerships fix it temporarily but then it happens soon after? It happened to me in Phonenix Az. I wasn’t down the road 100 miles and the same code popped up.

 

I’m new at this. First time O/O. I’m not sure if they did. But I can ask when I go back. They said the code is generic and could be more than just the DOC. Well hell after 4 times you think they’d figure it out by now

 

Houston Tx
I also was also told to idle up during my 10 hr break to 1000 rpms to help with the soot build up. Is that ok on the engine?

I haul liquid chemicals and need to keep their temps regulated plus living in Texas yes I will run my truck LOL

 

Thank you I agree a 1000 is crazy. Mine idles at 800.
What’s your opinion on Diesel Force Treatment? It’s supposed to clean out your engine and your after treatments from all the soot and carbon.