2001 Ford Ranger po401 emission code

2001 FORD RANGER
140,000 MILES • 6 CYL • 4WD • AUTOMATIC
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BUBBAB
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  • 5 POSTS
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.
Apr 15, 2010 at 5:57 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
There's a problem with the EGR valve and also it will cause spark knock which is detonation if it doesn't open
Apr 15, 2010 at 6:13 AM
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BUBBAB
  • MEMBER
  • 5 POSTS
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
Apr 15, 2010 at 9:08 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Check for carbon buildup on the EGR tube
Apr 15, 2010 at 11:17 AM
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BUBBAB
  • MEMBER
  • 5 POSTS
doesnt have alot of carbon build up. any ideas would be helpful
Apr 15, 2010 at 12:30 PM
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BUBBAB
  • MEMBER
  • 5 POSTS
could it be caused by weak vacume to the egr valve and if so what could cause that
Apr 15, 2010 at 12:32 PM
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