P0404 Input needed

[Kejar7]

My 07 5.7 was showing P0404, so I replaced the EGR and cleared the codes. I travel about 80 km and the light comes on again, so I pulled the PVC and cleaned the PCV and the housing. Also at this time I remove the PCV tube and it is clean and unobstructed. Bolt it all back together clear the codes with my OBD reader and cross the battery terminals to do a hard reset. I travel about 80 kilometers and light comes back on again.
So looking to see if anyone else has a few more avenues to explore?
Is there anymore sensors in this system like a temp sensor or something like that in this system?
The truck has 233K or 140000 miles

Cheers,
Rick M

 

[fastf]

You need to put it on a diagnostic scanner that will give you live data.I have a code reader myself and it gives you a idea where to look but will not give engine date while its running.A scanner will get down into the computer and find the problem.