Hello,

I have a 2001, 4.6 L with about 83,000 miles. The engine check light came on. I went to Checker and had the codes checked and it came up with the EGR valve several times. I replaced the EGR and the light is still on. The Haynes manual states that it may take 40 warm starts to reset the light but I have had the new part on for maybe one month. I checked the PCV valve and it seems fine.

Any other things I am missing?

Thanks

Doug S.

 

What are the exact codes? The exact numbers, not as interpreted by the parts store......

 

Yup, you need to get the numbers in order for anyone to know what your talking about exactly.

 

I can guarantee that:

1) It was a P0401 code

2) It was mis-diagnosed

3) It ain't fixed

P0401 is one of the most common faults discussed here. Five minutes of reSEARCHing should be enough to get you on track.

Steve

 

99% of the time, the check engine light comes on in Ford & Mazda trucks for code P0401 (insufficient EGR flow). And, 99% of the time, the EGR valve is good. The two main culprits are (1) The DPFE sensor (2) The EGR ports in the intake elbo are clogged.

 

I don't know about 99% of the time - I would say most of time it is a 401 code.
I've gotten 402, 406 before .
It's easy enough to go get the numbers to be sure , I would do that before replacing the DPFE or taking your TB and elbow apart - could be the EGR popet valve.
Up 2 U..

 

Yes the 401 code does seem familiar. I had it checked several times over the last 6 months. I already checked the egr ports in the intake elbo and cleaned them out even though they did not look clogged to me.

I don't know where the DPFE sensor is located or the EGR popet valve.

Thanks for the help and addiiotnal information would be appreciated.

 

If you have the 401 code - then replace the DPFE Sensor

Ford updated these recently , unfortunatly the updated version can only be had at the dealerships. Third party auto suppliers don't carry the updated versions yet as far as I know .

#4 is the DPFE sensor..




Parts
. OEM Part
. Price
Pressure Feedback Exhaust Sensor
.
. Pressure Feedback Sensor
. F77Z9J460AB
. $112.47
Notes
Labor
. Skill
Level
. Mfg.
Warr.
. Std.
Pressure Feedback Exhaust Sensor
.
. Replace
. B
. 0.1
. 0.3
Notes
.
. Does Not Include: EEC Quick Test Or Pin Point Test Diagnosis Time.

 

psssh egr is ghey....

 

I've been getting the same 401 code on my 02 4.6. I cleaned the inlets in the intake manifold/throttle body. Thought that would do the trick but it came back with the same code. I followed the directions in the Hayne's book and checked the DPFE sensor and EVR regulator voltages, and they were all normal. The DPFE sensor is in a different location on my truck, it's right on top of the EGR tube, and is a lot smaller than yall's picture.

 

Is it black?

 

Here's a pic of it...

 

Wow !! That's different!! Never seen one of those before..

I like it tho , better than that big gaudy thing that I have. I had to go look at the 01 in the driveway just now to see if it had one like that

Nope.

Is that stock?

 

As far as I know that's the stock piece. The truck was originally bought new by the company my dad works for to be used as a daily driver, for a big shot to just drive around in. They sell the vehicles when they reach a certain mileage, this one is pushin 150k, and so my dad bought it. I don't think that the company would put anything aftermarket on the truck, with the exception of strobe/service lights. That's not the new sensor from Ford is it? It's a genuine Ford sensor.

I just checked advance auto parts website and this is what I found....

EGR Pressure Feedback Actuator....Is that the same thing as the DPFE?

 

Also when I checked the voltage on the TPS, Hayne's said that it should read between .5 to 1v at closed throttle and increase to between 4 and 5v at WOT. That was just not the case on mine. It read 4.5v at closed and steadily decreased as I opened the throttle. I had everything hooked up like the book said, but that just doesn't seem right. Perhaps the TPS is the problem cause the 401 code. What do yall think?