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1999 Mazda B3000 P0401 code, but no engine troubles

Tiny
ALASKABOY
  • MEMBER
  • 1999 MAZDA B3000
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 122,000 MILES
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.
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Saturday, April 18th, 2009 AT 6:10 AM

5 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Change DPFE sensor
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Saturday, April 18th, 2009 AT 6:12 AM
Tiny
ALASKABOY
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  • 4 POSTS
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?
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Saturday, April 18th, 2009 AT 6:21 AM
Tiny
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
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Saturday, April 18th, 2009 AT 6:27 AM
Tiny
ALASKABOY
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Thanks!

DPFE it is.
(Oh and I have the Haynes Manual for it. Thanks)
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Saturday, April 18th, 2009 AT 6:31 AM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS


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Saturday, April 18th, 2009 AT 6:44 AM

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