So I popped a CEL and am getting code P1400 Differential Pressure Feedback Electronic Sensor circuit Low Voltage. Some one on a general racing forum gave me this:

'p1400 is DPFE low voltage... meaning the sensor is sending lower voltage than normally to the PCM at idle....

DPFEs are known for issues on Ford's... Ford has a few bulletins on the one in your explorer in fact.... Don't come cheap but the parts guy at the Ford dealer (Only place to get yours Sorry) will know all about this gem....

Ford base number is 9J460'

Does anyone know this to be true on the 4.0L? I would like to try to find the TSB(s) on it if they are out there. Does anyone happen to know where Ford stores the Ford truck TSBs? I know that Hyundai stores thiers online and wounder if Ford does the same.

What is the fix?

 

im going to guess it needs a new DPFE sensor.
they are a very common issue on fords. they get old and corrode.

make sure you get the plastic one when you buy a new one.

 

Do you hapen know where this sensor is located? or how to replace it?

 

Simple to replace, 2 bolts and a electrical connection and easy access. It is on the drivers side and sits on the side of the air intake. Once you get the new part, pop your hood and you'll see exactly what I mean. Just be sure to put the new gasket on that comes with the part. I changed mine a few months ago and my old one did not have a gasket but the new one did.