Wat does code p1400 means
engine light is on
In order to give you accurate information. I need size of engine example 2.0 L 3.0L. but code P1400 means Differential Pressure feedback EGR circuit low input. Maybe your differential oil is low.
The code P1400 reads "DPFE Sensor Voltage Low" (Ford, Mazda). Often it's caused by a bad DPFE sensor or clogged EGR passages. DPFE stands for (Differential Pressure Feedback EGRI) I would clean the EGR valve which cost nothing. If that does not cure the problem, you may need to replace the DPFE sensor, which does cost, and it may not fix the problem. If you want to be sure you replace the correct part, then visit your local Ford dealer.
Before you replace to many parts you need to do an exhaust back pressure check,back pressure maximum @ 3,000 rpms is 1.5 to 2 psi. Eliminate a plugged exhaust before going to high dollar parts
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