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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
Over the weekend I replaced my lower intake gasket and now my check engine light is on. The code is P1401. I carefully labeled everything and believe that I connected everything correctly when it went back together. I gave it a quick look over last night and I dont see anything out of place. Has anyone ever had this problem before or does anyone know what could be causing it?
Over the weekend I replaced my lower intake gasket and now my check engine light is on. The code is P1401. I carefully labeled everything and believe that I connected everything correctly when it went back together. I gave it a quick look over last night and I dont see anything out of place. Has anyone ever had this problem before or does anyone know what could be causing it?
Thanks. Just did another quick visual on all the tubes and everything looks fine, I will have to look further into everything else once the weekend rolls around. If any dirt had fallen down the egr oultet tube that is inside the upper intake, could that have caused this to happen?
Thanks. Just did another quick visual on all the tubes and everything looks fine, I will have to look further into everything else once the weekend rolls around. If any dirt had fallen down the egr oultet tube that is inside the upper intake, could that have caused this to happen?
P1401 is an EGR excessive voltage code, I believe above 4V (5 is max). P0401 is a lighter EGR flow. Your valve would have to be held all the way open by a piece of debris and you would barely idle if that were true. So my thinking is toward the sensor. I don't believe in just replacing parts so read on....
The other thing to check is if you didn't accidentally mix up the DPFE hoses, one has a smaller diameter than the other. This can be hard to tell by quick inspection. Look at the tubes on the EGR tube for reference, see what is smaller and larger.
When you did your intake you probably had to disturb the DPFE, which if it is original is on borrowed time. They are a known failure item. It is possible it was damaged, I recently replaced mine. If you have a voltmeter(or scantool) you can confirm dpfe voltage at idle and also (key in run but engine off)- should be very close to either .5 or 1 volt. There are 3 wires to the dpfe, one is ground, one 5V and one is the dpfe voltage.
Mine read 2.5 volts at idle, so there was no reason to look further.
With a scan tool or a DVM you can easily do this test. You may have to pin pierce wires to test it with the DVM. You can also apply a bit of vac to a dpfe port and watch for changes in voltage.
Without knowing voltages we can just guess....If your DPFE does not pass that test you MUST replace and it will likely solve the issue.
Thank you so much for all the info. I just took off the plug going into the dpfe and tried to clean it up some, plugged it back in and cleared the computer. So far the light has not come back on again(fingers crossed). Again, thank you so much for all the info.
