I have a 98 F150 4x4 5.4L 140,000 miles and just received the P1406 code. I went to a local parts house that checks the error codes. They said I would have to contact the dealer to find out what the code was.


Thanks
Charlie

 

<table border="1" bordercolor="#0000ff" width="420"><tbody><tr><td valign="top">P1406 </td> <td valign="top"> DPFE Downstream Hose Off Or Plugged (Ford, Mazda) </td></tr></tbody></table>
Stolen from autorepair.com I think.

P1406 Differential Pressure Feedback Electronic Sensor circuit Downstream Hose

That one is from this site on this page --> https://www.ford-trucks.com/article/idx/7/0/

Hope it helps.

 

Has anyone encountered this problem? Would it be a hose off or clogged or is the DPFE sensor bad? How would I go about checking this? Where at on the engine would I look to find the sensor? Thanks for your help.

 

Hi and welcome to the forum

The DPFE should be under the throttle body cover, on the driver's side of the engine.
There is the EGR tube that runs from the driver's side exhaust manifold up to the EGR valve. Off that are the 2 hoses that go to the DPFE. Check to make sure they are both ok, not plugged, cracked, fallen off etc.

 

Kijutsu and Racerguy,

Thanks for you quick responces on my issue. I will check the hoses out tomorrow. If there is a problem with the hose cracked, clogged, etc. Once I get it repaired I will have to have the code cleared from the OBDC correct? Thanks again for you help and time.

Charlie

 

To clear the code you can just remove a battery terminal for 5 minutes.