well i have p1400 and p0401they both are low flow faults if im reading them right is there a certain sensor that would set both codes like the dpfe and is this a double diagram egr or a electric relay

 

First thing is you need the 'full' discription of the codes and not just the short form usually given.
Here is the way your codes play out.
The PCM has it's own monitors for the outside sensors.
The p1400 is one such monitor that looks at the operating voltage supply to the DPFE. If it is out of limits or missing, the PCM code p1400 is set.
The p0401 is a low flow test code.
My opinion is that the DPFE cannot read the low flow test when it is done and also sets this code as a result of the DPFE operation failure.
Bottom line is to check if the harness and plugup to the DPFE has an issue. If not, the DPFE may be faulty.
Get this solved first and the 401 code may not be a real fault and clear it'self.
A faulty DPFE circuit cannot read any 400 series tests.
After all repairs, clear the codes so you are not looking at old history.
Do two drive cycles to see what may come back and treat them as new codes or the same fault has not been found and repaired.
Some readers and all scanner may display a code P1000.
This is normal until the PCM completes testing of all functions for passing, then the 1000 code clears. It does not light a CEL lamp in any event because the code is not a regular trouble code..
Good luck.

 

well i see what it looks like now. found a pic of it. will have to look at hoses tomorrow and determine what to do. will see if intake covered in red crap. thanks for reply.