Question about 1998 Mazda B-Series
P1400 DPFE Sensor Circuit Low Input
for instance if the EGR valves orifice tube assy is carboned up, it could cause the DPFE to put out a corrupt PID to the computer.
If any of the vacuum hoses to the DPFE sensor are compromised, leaking vacuum, or clogged up, that could mess with the PID it sends to the computer.
So there are a number of other things that can cause the DPFE sensor to output what ever signal it sends to the computer, so we have to take All of that into consideration when doing a trouble shoot.
The EGR system is a mature & rather rugged system, so In most cases, look for something simple, like a bad rubber vacuum line or loose fitting, or carbon build up in the EGR orifice tube assy, or maybe a leaky EGR or EVR diaphragm or vacuum line.
Seeing as how the EVR has been replaced I suppose it's kinda low on your suspect list, but with Murpheys Law being what it is, I wouldn't take it off the list yet!!!!
Get a vacuum tester & check the EGR & EVR diaphragms to make sure they're holding vacuum & that the interconnecting vacuum line is holding vacuum.
Posted on Aug 19, 2010
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Posted on Jan 02, 2017
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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.
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