obd2 codes p0304, p0305, p0306, and p0402 on 2001 v6 mustang

dashiznit74 · **Joined:** Sun Dec 31, 2006 5:01 pm **Posts:** 13

I am recieving these codes and was wondering if anyone could maybe tell me why im recieving these codes!! any help would be greatly appreciated! i know what the codes stand for but i have no idea what the causes are for this or what steps to take to possibly find out why im getting these codes!!! please anyone help is needed thanks :?:

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jeff compton · **Posted:** Tue Jan 02, 2007 5:31 pm

evey done a tune-up or checked the egr valve and dpfe?

dashiznit74 · **Joined:** Sun Dec 31, 2006 5:01 pm **Posts:** 13

yep just recently replaced the egr valve and ive checked it out and did a vacuum test and everything.. egr valve seems fine!! changed the plugs plug wires and ignition coil also!! would the p0304, p0305, p0306 be caused because of the EGR system? i have the haynes book for my car but the pictures showing where the dpfe is located are different style motors then mine so im not sure which sensor is the dpfe sensor so i havent checked that yet!! :?:

jeff compton · **Posted:** Tue Jan 02, 2007 5:52 pm

you might have a vaccum leak around the intake gaskets, get the dpfe from the dealer and trace the vaccum schematic on your rad support, it might show it there or it's boltted to the intake manifold somewhere! what kind of plugs did you use?

dashiznit74 · **Joined:** Sun Dec 31, 2006 5:01 pm **Posts:** 13

i checked for vaccum leaks and just replaced the intake manifold gasket recently!! i was using the bosch platinum +4 plugs but i just recently replaced them with i believe autolite platinums after this problem starting occuring!!

CarGuy · **Joined:** Sun Oct 15, 2006 11:36 am **Posts:** 22

for the code P0402 EGR excessive flow replace the DPFE sensor with the OE sensor and reset the light and see if your misfire codes go away.

dashiznit74 · **Joined:** Sun Dec 31, 2006 5:01 pm **Posts:** 13

i will definately try replacing the DPFE sensor!! My car lacks power badly and when i drive on the highway it struggles to just do 65-70mph!! ive been checkin the error codes all the time and sometimes i get the p0402 code and sometims i get P0401 instead right now its the P0402 code!!! does that sound like it could definately be the DPFE sensor?? well either way the DPFE is the next possibility that it could be so im gonna for surely change that!!! i appreciate all your help with this... all the more help i can get the better :!:

jeff compton · **Posted:** Wed Jan 03, 2007 9:22 am

use the dealer part!

dashiznit74 · **Joined:** Sun Dec 31, 2006 5:01 pm **Posts:** 13

Is the sensor circled in blue the DPFE sensor or is that not the right one?? And the one circled in red is the vacuum regulator correct?? I just thought i'd try and test the sensor but not sure if thats it or not!! any tips for testing the DPFE sensor or tips as to how to remove it??

jeff compton · **Posted:** Thu Jan 04, 2007 5:46 pm

I don't work on Fords everyday so I can't be sure but I think it would likely be the one on the left, here's a thought, if it's disconnectted and the car is startted and run it might generate another code, if it does that should prove that is in or isn't the dpfe, or ask the dealer parts dept to see a new one! You can read there voltages with a scan tool but for the cost if you have locatted the right part and the plug to it has the proper voltages then you likely would be best to change it. A plugged up port in the throttle body or tube could generate that code as well but the dpfe's are super common failures!

dominic novak · **Posted:** Thu Jan 04, 2007 8:49 pm

The one in blue that is it , it has two air lines going too it . High side and a low side . The one circled in red is a solenoid for the egr system . check what lines you can for restrictions when you get it apart .

dashiznit74 · **Joined:** Sun Dec 31, 2006 5:01 pm **Posts:** 13

Thanks for verifying that the one in blue is it i wasnt sure but thats the one i thought was it!! but do i need to remove the whole egr pipe that goes from the egr valve to the exhaust manifold or does the sensor come off :?:

any tips on removing the sensor would be greatly appreciated :!:

thanks for the help with this!!!

dominic novak · **Posted:** Sat Jan 06, 2007 9:02 am

No I'm pretty sure you can take off the sensor by itself . Are you going to keep the car long and maintain it your self ? If you are get a chiltons manual , that should tell you every thing you need to know .

dashiznit74 · **Joined:** Sun Dec 31, 2006 5:01 pm **Posts:** 13

Not sure how long ill be keeping it but i have tried to find a chiltons book for my car and i cant find one anywhere.. but i did get the haynes book for my car a while ago and it has been great help with lots of problems and all... but in the section for the EGR where it tells how to remove the DPFE sensor, the motor setup and everything is totally different then how mine is... this is the picture of the illustration for removing the DPFE sensor from my haynes manual

and this is my motor and DPFE sensor on my car

as u can see they are different and the book says..... 1. unplug the electrical connector from the sensor 2. clearly label and detach both vacuum hoses 3. remove the sensor mounting screws (see illustration) and remove the assembly 4. installation is the reverse of removal!!! but see it says remove the screws from the sensor but if you look at the pics of my actual car.... there are no screws holding it on to anything!!! on the bottom of the sensor the only thing holding it to anything is like the rubber things connecting to the EGR tubes!! so how do i remove it??? just pull it off the EGR tubes or what??? :?:

dominic novak · **Posted:** Sat Jan 06, 2007 5:16 pm

Chilton and Haynes are the same company , thats pretty much the same book. I've seen those books make mistakes, so call around to make sure you are removing the rite part . If the clamp on the hose isnt reuseable get new ones .

obd2 codes p0304, p0305, p0306, and p0402 on 2001 v6 mustang

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