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


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Old 12-01-2014
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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:

http://www.explorerforum.com/forums/...ighlight=p0402

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.
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Old 12-01-2014
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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...........
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Old 12-01-2014
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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.
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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.
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