Thursday, November 24, 2011

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 sensor and that fixed it for about 8 months then the check engine light came back on put another new DPFE sensor on it and cleaned hoses and metal that comes out of manifold that fixed it again for about a year now light is back on and same code is there what do i do now? I really wanna be ablw to fix it myself cause its the only thing i have to drive. I can tell this is going to happen before the light comes on cause when you are driving down the road at a steady speed it does this jerking like and it only get worse until you put a new DPFE sensor on it. Any 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 %26amp; 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.|||What does the actuator solenoid look like and where is it located?

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|||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 .|||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.

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