Silver DPFE Sensor
The Service engine soon light came on and my Fleet Ford Dealer does not have any openings in their schedule for 2 months.
So I bought a OBD II Scanner and did some trouble shooting on my own.
I'm a Factory trained MBZ Tech so reading manuals and applying the info is not hard for me.
Bought a OBD-II Tech manual been reading that. Some applies some does not.
What I want to know is I have a code P1406 the tech manual says its the downstream hose is either plugged or disconnected. On the silver DPFE which is the downstream hose?
I have 2 hoses on it on the box it says ref lining up on the first hose there is a hose next to it in line with the REF marking.
Which is the downstream hose? The one nearest the REF marking or the hose next to it?
Thanks for the help in advance.








