where is the DPFE located
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Senior User
Joined: Aug 2004
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From: Lewiston, Idaho
where is the DPFE located
Working on a 2002 explorer 4.6 liter. I got the new sensor just need to replace the thing, looked around on the drivers side of the engine but can't find the dang thing, where is it hiding?
Tuned
Joined: Feb 2007
Posts: 288
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From: SW Florida
Gotta take the plastic engine cover off (4 bolts). The DPFE will be close to the top center of the engine near the EGR.
Did you get the replacement DPFE from Ford or aftermarket? What did it cost? I've read that some aftermarket are not correct for the '02s, but don't know that for a fact. My '02 4.6 set the SES yesterday and I had it scanned at Checker Auto. They said it was code P1400 and something was wrong with my EGR but I think it's more likely the DPFE. I'll probably get in to it this weekend.
Did you get the replacement DPFE from Ford or aftermarket? What did it cost? I've read that some aftermarket are not correct for the '02s, but don't know that for a fact. My '02 4.6 set the SES yesterday and I had it scanned at Checker Auto. They said it was code P1400 and something was wrong with my EGR but I think it's more likely the DPFE. I'll probably get in to it this weekend.
Cross-Country
Joined: Aug 2004
Posts: 85
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From: So Cal
Same here. Went to get it smoged and threw out that same code. $32 and EXACTLY 7 minutes later, it was good to go. That was 3 weeks ago. So far so good.
Elder User
Joined: Jan 2008
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What is P0402? Why are you changine the DPFE? Maybe the DPFE is doing its' job and you're swapping a part that doesn't need to be changed. The DPFE is supposed to tell the PCM what the EGR is doing. Just because you get a EGR related code doesn't mean you go out and buy a new DPFE. Is the vehicle high mileage? Have you pulled the throttlebody elbow where the EGR is bolted on to see if the ports are clogged with soot and tar. Looks like tar in a cigarette filter, but a big glob of the strff. If the EGR ports are clogged shut the DPFE will tell the PCM about it and you will get an EGR related code. That doesn't mean the DPFE is bad. It just means the DPFE is doing its' job and the DPFE is working just fine. The DPFE can get clogged with soot and tar over time as can the EGR valve itself, but they can be flushed out. The elbow takes more work and must be removed. You may have just wasted your time and money. You'll find out if P0402 comes back. Don't be a parts changer. Do your homework first and then head to the parts store.
Cross-Country
Joined: Aug 2004
Posts: 85
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From: So Cal
"check engine" light and allowed it to pass smog.
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Freshman User
Joined: Feb 2008
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It is the DPFE. The EGR will throw a totally different code. Replace your DPFE. My explorer threw the same code, replaced it and it was fine. By the way I am a Ford tech. The EGR WILL throw a different code if it is not opperating properly!
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Thread Starter
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Senior User
Joined: Aug 2004
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From: Lewiston, Idaho
Well, I replaced the DPFE, and the explorer was driven probably a total of 700 miles over the past 4 days. Got no more codes, and everything seems fine, guess time will tell though. Explorer has 70,000 miles btw.
Elder User
Joined: Jan 2008
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I googled P0402. It's Excessive EGR flow. You wouldn't think a defective DPFE could cause excessive EGR flow, but one of the listed fixes is replace the DPFE. I guess if the DPFE is partially or even completely clogged shut it will tell the PCM that the flow is insufficient and erroneously add more flow than is needed. This then results in excess flow(P0402).
Senior User
Joined: Apr 2007
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remember the dpfe sensor outputs a voltage 0- 5volts no flow less than 1 volt higher the flow higher the voltage. Now when condinsation from the hot exshaust happens inside over a period of time you get a high voltage reading even with no flow bing go bang go bong go you get a may be p1400 /p1401 /p1402 depending on the short or open reading sent to the pcm. being a ford tech and being a recall and tsb on these I would put my money on the dpfe sensor 100 % of the time with these codes and no driveabilty.
Elder User
Joined: Jan 2008
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Doesn't the DTC strategy have to allow for condensation since moisture trapped in the cool exhaust is a fact of life especially in areas of high humidity? I wouldn't think the monitor would run until after a sufficient amout of time had passed after a cold start to boil out all the water and turn it to steam and send it out the exhaust, but the soot and tar that are componets of recirculated exhaust do NOT boil away. They turn to a gummy, gooey mess that eventually cloggs the DPFE, EGR valve and EGR ports in the throttlebody elbow. I've cleaned some of these clogged throttlebody ports after already having replaced the DPFE and EGR valve(neither of which got rid of the CEL which if I remember was P0401) and that finally solved the problem. Some Ford techs(which I am not altho I work on a lot of Fords-good money maker) have said on this site that you can clean(flush) the DPFE as long as it is the new style(plastic body rather than replacing it. It isn't all that expensive to replace so that's why I've been doing. If the vehicle is high mileage I think you're going to find those two little ports in the throttlebody elbow clogged with the gunk you find at the end of a cigarette filter.
Senior User
Joined: Apr 2007
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Well i belive what happens over time is the electrical side of the dpfe sensor get contaminate sending bogus readings to the pcm I have yet to see or hear of anyone trying to clean one but if it work great. I have only seen a powder type corrision on them when you take the hi or ref hoses off. The black by product is only on the intake manifold side and no way able to get to the dpfe. the dpfe sensor only get exshaust gas from above and below a inline orfice in the egr tube. From this the dpfe sensor can tell how much egr flow is flowing. If the egr flow is plugged or resiticted the pcm can duty cyle the egr regulator for more or less flow. If after this the dpfe sensor show no change a code may be set
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