P1400 indicates the following:
Differential Pressure Feedback Electronic Sensor circuit Low
Voltage
Most common cause is a bad DPFE sensor.
Hi there: DTC P1400 - Differential
Pressure Feedback Electronic (DPFE) sensor signal was below 0.2 volts.
Enabling conditions: Run engine off or running self tests to check this
code. Blocking Action: This code can block the following monitors: Fuel Control, O2 monitor, catalyst, misfire, and EGR monitor. Testing:
Run the engine off and running self tests. If the code does not show
up, it is an intermittent problem. Check for 5 volt reference that is
low, damaged sensor or a short to ground in the signal wiring. Probes
use an EGR position sensor signal which can be low because of a worn EGR
pintle that drops too low in the EGR valve or for a warped EGR valve
base.
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Check this out. http://www.fordforums.com/f57/2002-ford-explorer-p1400-code-dpfe-sensor-150191/
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