P0402 code tossed out - Ranger-Forums - The Ultimate Ford Ranger Resource

2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

LinkBack Thread Tools Search this Thread
Old 12-01-2014
Thread Starter
iTrader: (2)
Join Date: May 2014
Location: Lake Mary, Florida
Posts: 349
P0402 code tossed out

I've been posting here the last couple of weeks pertaining to a bit of pinging I was getting on my 2000 3.0 Ranger. I replaced the plugs, plug wires, and coil, as I did not know of any prior maintenance that was done on this truck before I bought it 6 months earlier. Pinging went away.

At the same time I did the major tuneup, I also replaced the DPFE with an aftermarket one, as I also figured that perhaps not enough exhaust gas was being circulated into the cylinders to help cool them down, leading to the pinging. After 10 minutes of driving with this new DPFE module, I got a CEL "P0402" excessive EGR exhaust gas code. I reset the code, drove again, and within minutes, the code reappeared.

I installed the original FoMoCo DPFE module (stamped on the back of the part), and the code has not reappeared. Here is a good link for testing your DPFE before you replace it:


Just posting this to others to be careful in buying cheap aftermarket replacement sensors. Sometimes it's best to buy the good stuff at a slightly higher price.
Reply With Quote
Old 12-01-2014
RF Veteran
iTrader: (1)
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,601
Interesting, I had read that 3rd party DPFE sensors lasted longer than Fords.

Good info.

I have to ask, since EGR hose(intake) and exhaust hose being reversed would cause P0402 is it possible that happened with new DPFE, mislabeled.
I believe the exhaust hose is slightly larger to prevent that but...........
Reply With Quote
Old 12-01-2014
Thread Starter
iTrader: (2)
Join Date: May 2014
Location: Lake Mary, Florida
Posts: 349
When I removed these two hoses from the DPFE, I kept the one on the left (facing the front of the DPFE) to the left, and the one on the right, to the right. I installed the same way.

What I found from some early searching was that the early Ford DPFE's were alluminum, and these were the faulty ones; Ford later made them in plastic, and are the ones to get, sp perhaps this is why the "aftermarket" were better(?), as they were made in plastic.

Found these two pictures that show the "correct" connections, as both vacuum lines connect to nipples on the tube that connects the exhaust manifold to the EGR; one would be the "intake" (closest to the EGR) and the other would be the Exhaust (closest to the exhaust manifold). I planned on removing the EGR itself to clean it in case it was sticking, but I cannot budge the nut loose from the tube that connects from the exhaust manifold to the EGR. Anyone know what size this bolt is so I can buy a proper wrench (simular to the type that's used to loosen brake line connections; i.e. "3/4 " type wrenches)? I've read that heating up the bolt and spraying PB-Blaster on it may help as it cools, But a good wrench that can get almost all the way around the nut would be good too. I don't want to cut the tube off and use a socket, as the tube appears to be in good shape.
Attached Thumbnails
P0402 code tossed out-dpfe_connections.png   P0402 code tossed out-dpfe_good.jpg   P0402 code tossed out-plastic_dpfe.jpg  

Last edited by bucko; 12-01-2014 at 02:22 PM.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
first p0401 (new DPFE), now p0402 (new EGR) ryan_88 4.0L OHV & SOHC V6 Tech 7 07-11-2017 08:27 PM
Had P0402 now P0401 1999 ranger Akuma 2.9L & 3.0L V6 Tech 1 02-08-2013 09:56 AM
A tossed butt bazzman1953 General Ford Ranger Discussion 2 03-29-2008 12:15 AM
Syncros going out or clutch going out??? rangedawgg Drivetrain Tech 4 08-31-2005 12:30 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -6. The time now is 05:33 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.