The DPFE sensor is a totally separate sensor. Look for the feed pipe to the EGR valve and follow it towards the exhaust. Somewhere along that line you will see two small pipes leading to hoses, that lead to the sensor.
Dpfe sensor is the delta (differential) pressure feedback egr (exhaust gas recirculation) it monitors the pressure on the egr valve to make sure it is working.
some 1997 mountaineers didn't come with the dpfe sensor, you will have to look at the egr positioning sensor which is right on top of the egr valve itself . hope that helps
From what I understand , it is the sensor that the Powertrain Control Module uses to determine exactly how much the EGR valve opens at all driving conditions
on the 4.2l it is on top of the egr valve. you have to buy the whole thing its about 170 bucks.
A P0402 indicates that the PCM is seeing voltages higher than expected from the DPFE(Delta Pressure Feedback Exaust) sensor. The DPFE is the EGR position sensor. The high than expected reading could be caused by an EGR valve that is either sticking open, EGR valve that is being held open by the EGR vacuum regulator, or it could be a faulty DPFE sensor.
Ford is the only American car company that uses a DPFE sensor. GM dpfe sensor are built into the EGR.
On my 1995 Ford Explorer with the 4.0 liter OHV engine the DPFE sensor ( differential / or delta pressure feedback Egr sensor ) is located on the upper intake manifold on the drivers side of the engine
I'm not aware that part was installed on Villagers. It would be on the EGR valve if it was.
I believe the DPFE is called a Differential Pressure Feedback EGR sensor It has something to do with controlling the amount the EGR valve opens ( P.S. I'm not a mechanic / technician )
Possibly the DPFE sensor(?)See "Related Questions" below for more detailed information about the EGR / DPFE combo
I'm not a mechanic / technician but I had the DPFE sensor changed on my Ford Explorer . As far as I know it is used to control the amount the Exhaust Gas Recirculation ( EGR ) valve opens