1999 Mazda b3000 p0401 code, but no engine troubles

1999 MAZDA B3000
122,000 MILES • 6 CYL • 4WD • AUTOMATIC
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ALASKABOY
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Any ideas what's wrong if I am getting a p0401 code (EGR Recirculation flow insufficient) but there is no change in engine performance, no pinging, no knocking, or anything else?
I have reset the code twice, last time was after i put a tank of hi-test gas in it. Each time the code came back on after about 200 miles.
Apr 18, 2009 at 6:10 AM
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BMRFIXIT
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Change DPFE sensor
Apr 18, 2009 at 6:12 AM
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ALASKABOY
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Thanks! ...but in the meantime..

Yeah that's what i read somewhere else, but it seemed to coincide with poorer engine performance (like knocking or pinging) as well.

Sittin here thinking about it could it be something simple like the PCV valve?
Apr 18, 2009 at 6:21 AM
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BMRFIXIT
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No effect on engine performance at all
all it does it report the position of the EGR to the PCM
its an emission thing only
Apr 18, 2009 at 6:27 AM
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ALASKABOY
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Thanks!

DPFE it is.
(Oh and I have the Haynes Manual for it. Thanks)
Apr 18, 2009 at 6:31 AM
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BMRFIXIT
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https://www.2carpros.com/forum/automotive_pictures/99387_Graphic1_305.jpg


https://www.2carpros.com/forum/automotive_pictures/99387_Graphic2_148.jpg


https://www.2carpros.com/forum/automotive_pictures/99387_Graphic3_69.jpg

Apr 18, 2009 at 6:44 AM