2001 Ford Ranger PO401 emission code

Tiny
BUBBAB
  • MEMBER
  • 2001 FORD RANGER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I keep getting this same trouble code over and over. I have had my truck fixed but they keep wanting to replace the egr valve and dpfe sensor which is cool but I have had those replaced twice so I know those are not at fault. I have had my truck about 18 months and this is the third time it has done this. Also nomatter what grade of fuel I use I always have a bad spark knock. I know all of this is from the emissions but im puzzled at what to do next.
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Thursday, April 15th, 2010 AT 12:57 PM

5 Replies

Tiny
RASMATAZ
  • CERTIFIED MECHANIC
There's a problem with the EGR valve and also it will cause spark knock which is detonation if it doesn't open
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Thursday, April 15th, 2010 AT 1:13 PM
Tiny
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This is the third egr valve and I still have the same problem. I have replaced it and the dpfe sensor twice and the codes come back about 6 months later so I think it has to be something else
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Thursday, April 15th, 2010 AT 4:08 PM
Tiny
RASMATAZ
  • CERTIFIED MECHANIC
Check for carbon buildup on the EGR tube
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Thursday, April 15th, 2010 AT 6:17 PM
Tiny
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Doesnt have alot of carbon build up. Any ideas would be helpful
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Thursday, April 15th, 2010 AT 7:30 PM
Tiny
BUBBAB
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Could it be caused by weak vacume to the egr valve and if so what could cause that
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Thursday, April 15th, 2010 AT 7:32 PM

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