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I have a 2000 Ford Ranger 3.0L engine, 2 wheel drive, with automatic transmission. Check engine light came on about 3 months ago. checked with scanner and P0401 EGR flow insufficient came up. cleared it and it came back. truck seems to be running fine. I didn't take autoshop as a kid, so i probably will need a little hand holding on this one.
I'm not an auto technician, but I've seen quite a few posts regarding the same problem and DTC that you are exeriencing. In almost all cases the culprit turned out to be a faulty DPFE sensor. (DPFE = Differential Pressure Feedback EGR). The sensor is easily relaceable and not that expensive (relatively speaking, of course).
I'm not sure there is a test for the actual sensor itself. Haynes and Chilton's Manuals do not show one.
Here's a quick reminder: If/when you replace the DPFE sensor, make sure you disconnect the negative battery terminal for at least 15-20 minutes so that your PCM (computer) will reset and then adapt to the new sensor.
I'm going to change my DPFE sensor tomorrow on my 2000 Ranger XLT i have the P0401 Code.. I keep hearing different stories on how to clear the PCM from the P0401 code--I'm told that disconnecting the battery for 15 min WONT clear the code and some say it will.... Thanks for any help.......... MARK
there really ain't a way to test it that i know of.. i just for fun took mine to work and opened it up to see what the big deal was... and all i could see was what looked like alot for carbor buildup ???
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