How To: P0401 EGR Fix - Page 2

McCormack · 05-12-2009, 12:03 PM

There are 3.0 Ranger owners that are on their second and third DPFE Sensors, so it's possible that your DPFE might need replacing.

theoldwizard · 05-12-2009, 02:46 PM

Quote:

Originally Posted by leefpile

I have a p0401 code and I am losing my mind over this. I replaced the DPFE a few months ago when I first got the code. It came back now. I replaced the VAC control solenoid.

The most common cause of a P0401 is a clogged passageway. Either from the exhaust manifold up to the the EGR valve or from the EGR valve to the intake manifold.

Quote:

The EGR valve moves what I think is properly with vacuum applied.

Good visual check ! If you apply a vacuum to the EGR valve while the engine is at idle it should stumble badly or stall. If not, one of the passageways I mentioned is clogged.