Ford ranger check engine code P0401 help?

There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

A code P0401 most likely means one or more of the following has happened:

* The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced

* There is a blockage in the EGR (tube), most likely carbon buildup

* The EGR valve is faulty

* The EGR valve may not be opening due to a lack of vaccuum

In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.

Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open

Clean out the EGR valve and/or tubing to remove deposits

Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)

Replace the DPFE sensor (with a good quality / OEM one)

Replace the EGR valve

Lastly since there is also a actuator solenoid, you might have to verify that is has not having problems.

Ford Code P0401

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Ford ranger check engine code P0401 help?

Ford ranger check engine code P0401 help?

3.0L flex fuel engine. I know this code is an insufficient EGR flow or Exhaust Gas recirculation insufficient but this is the 3rd time this has happened. The first time i replaced the egr and the egr vaccum and that did not fix it then i replaced the DPFE...

Ford P0401

DPFE again thats the problem caused by moisture buildup in sensor and corroding. Ford has tried to fix with new plastic DPFE sensors and has slowed the problem somewhat. If you do a lot of short trip driving can cause more moisture because the exhaust doesent get hot enough to burn off condensation in exhaust and sensor. Replace the sensor and clear the code and replace with ford sensor .

My guess is it is a high mileage vehicle, or at least prone to use a little oil. I think that the DP FE sensor lines are getting clogged. try cleaning them out with some carb cleaner or pushing a fine wire through the small metal tubes to clean them. After that you may want to try stopping the oil burning.

Replacing the DPFE does not always fix the problem you see it plays a roll withe EGR and both could be bad hope this helps.