Here's the deal. I have changed the DPFE, EGR solenoid, EGR valve, throttle positioning sensor, and cleand my throttle body and I am stilll getting code P0402. What else might there be for me to do to fix this problem?

 

have you ever cleared the code after replacing everything?

 

Yes

 

what year and motor?

 

02' v8 4.6l

 

where did you get all the parts?

 

At the ford dealership

 

i'd look for a vacuum leak. is it running a little rough or doing anything that its not suppose to do?

 

It is a little sluggish. I have checked all the lines for cracks or any leaks. Maybe I will just replace all the lines and see what happens.

 

If it's a new valve - Suck test it. Make sure it's operational.

Leaks will produce that code like Matt suggests.


Heres where she may leak , the EGR (valve to plenum) uses an aluminum gasket. If used more than once, you need a very very thin coat of Permatex on both sides. Only IF it is indeed Aluminum. RTV Type -Black or Red will work / Coppers best.

The two rubber DPFE hoses can leak and the EGR pipe itself may leak.

Good idea to check all that stuff first.

 

was thinking something different...