Check engine light....B4000?
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Check engine light....B4000?
I posted this by mistake in a wrong forum location. Sorry...new user. I have a 97 B-4000, which is the same as a Ranger, that has a check engine light that codes PO401, which is a EGR failure code. I did the obvious, but incorrect thing and replaced the EGR valve. Same problem. I have been told the DPFE sensor that controls the EGR is most likely the problem. Has anyone else had this problem or can point me in the right direction. I'm new to this forum, so I apologize if I'm beating a dead horse.
Thank you for any help,
Fishhead
Thank you for any help,
Fishhead
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
DTC P0401 - Insufficient EGR Flow
Welcome to FTE!
Probably is the DPFE sensor, but while your replacing the DPFE you should also check the hoses running to and from the DPFE and the EGR Tube and make sure they aren't clogged, pinched or burned, etc. Look up the P0401 code here for more possible causes: 1995+ Ford OBD-II Diagnostic Trouble Codes (PDF)
The DPFE on my '98 4.0L looks like this plastic one, although they also can look like the metal one below it, too.
The DPFE is easy to replace, two screws, a couple of vacuum hoses and an electrical connector. Yoy want to get the plastic one as the replacment unit, inasmuch as they last longer.
An overview of the Ford EGR System can be found here: Ford DPFE/EGR System Summary
Probably is the DPFE sensor, but while your replacing the DPFE you should also check the hoses running to and from the DPFE and the EGR Tube and make sure they aren't clogged, pinched or burned, etc. Look up the P0401 code here for more possible causes: 1995+ Ford OBD-II Diagnostic Trouble Codes (PDF)
The DPFE on my '98 4.0L looks like this plastic one, although they also can look like the metal one below it, too.
The DPFE is easy to replace, two screws, a couple of vacuum hoses and an electrical connector. Yoy want to get the plastic one as the replacment unit, inasmuch as they last longer.
An overview of the Ford EGR System can be found here: Ford DPFE/EGR System Summary
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You are the Man Rockledge!!
What an awesome reply. This is better than any repair manual
I have seen. I looked at all the hoses and exhaust tube when
I replaced the EGR valve. The guy at Autozone ran the codes
for me and recommended replacing EGR valve. I guess that is also
a common problem. Autozone does not stock the Pressure sensor
and none of the local discount auto stores handle that sensor.
NAPA has one, but it is 55 bucks. I know that has got to be cheaper
than the dealer. I'll probably stop on the way home from work
and pick it up at NAPA. I've had good luck with all the other
parts I've purchased from them. I just happened across this
site running a search on google for EGR problems and it has
already been a blessing.
Thanks for your help and the great pictures.
Fishhead
I have seen. I looked at all the hoses and exhaust tube when
I replaced the EGR valve. The guy at Autozone ran the codes
for me and recommended replacing EGR valve. I guess that is also
a common problem. Autozone does not stock the Pressure sensor
and none of the local discount auto stores handle that sensor.
NAPA has one, but it is 55 bucks. I know that has got to be cheaper
than the dealer. I'll probably stop on the way home from work
and pick it up at NAPA. I've had good luck with all the other
parts I've purchased from them. I just happened across this
site running a search on google for EGR problems and it has
already been a blessing.
Thanks for your help and the great pictures.
Fishhead
Posting Guru
Joined: Jul 2003
Posts: 1,978
Likes: 1
From: Alvin, Texas.
AutoZone DOES stock the sensor and it costs about 70 bones.
Take off and show them the number on back of the sensor! They can trace that and need that SPECIFIC number to help you.
I fixed the two DPFE hoses when I got my code 332 on my 94, for low EGR input. Didn't have to go as far as a new sensor. Lucky.
Take off and show them the number on back of the sensor! They can trace that and need that SPECIFIC number to help you.
I fixed the two DPFE hoses when I got my code 332 on my 94, for low EGR input. Didn't have to go as far as a new sensor. Lucky.
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Thanks Alfred. I went ahead and stopped at NAPA on my way home from work
yesterday and picked up a new DPFE sensor and when I removed my old one
I did notice alot of corrosion at the hoses connections and up in the sensor
itself. I removed the hoses and ran a piece of wire through them and cleaned
them out. I went ahead and replaced the sensor due to all the junk up in it.
Ran great to work this morning and it is an hour drive...approx 45 miles.
Looks good so far, but I guess time will tell.
Thanks for all the help from everyone and God bless,
Fishhead
yesterday and picked up a new DPFE sensor and when I removed my old one
I did notice alot of corrosion at the hoses connections and up in the sensor
itself. I removed the hoses and ran a piece of wire through them and cleaned
them out. I went ahead and replaced the sensor due to all the junk up in it.
Ran great to work this morning and it is an hour drive...approx 45 miles.
Looks good so far, but I guess time will tell.
Thanks for all the help from everyone and God bless,
Fishhead
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