How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Eric Your Own Question
Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 30821
Experience:  Automotive Repair Shop Manager, Technician
Type Your Ford Question Here...
Eric is online now
A new question is answered every 9 seconds

2000 Ford Ranger 4x4: p100..I am not sure where to start looking

This answer was rated:

I am looking at a 2000 Ford Ranger 4x4 to but. Code P1400 and P1780 come up on scan test. I am not sure where to start looking. Is this a serious problem or an easy fix. Also, there seems to be "thrown" oil on the underbody and frame in the area of the differentil. Could this be a bad seal.
Thanks, Ed




P1400 DPFE (Differential Pressure Feedback EGR) circuit low input


This normally due to a faulty dpfe sensor and is located above the left exhaust manifold and egr valve tube. The dpfe sensor runs under $50 and takes about 15-20 minutes to replace:




P1780 Trans control switch (O/D cancel) out of self test range


This code normally comes on because the test procedure with scanner was not done correctly.


When doing the key on engine on test, you have to press brake pedal,turn steering wheel 1/4 turn, and press OD button on then off. Failure to do this will set this code.


I would have this code reset, then see if it returns. If it does and the test is done correctly, then the o/d switch in shifter is bad



As far as the leak, it could from a bad seal tailshaft housing, or even cracked case. The only way to find out is to clean it off, run it for a day or two and get it up in the air for a thorough inspection



Please click the ACCEPT BUTTON or ask for more help

Eric and 2 other Ford Specialists are ready to help you