2001 flareside

I did change my egr valve + my vacum control valve wat's next coad still comming back

ro87f150

if that doesn't take your check engine light off.. then.. spray the egr lines with carb cleaner.. the two that go to the egr position sensor and the copper looking one that goes to the egr valve.. that way you can clean up all of the carbon deposited so that it flows better and more efficient..

2001 flareside

thanks i will guive it a try, could the carbon build up afect the pulling in hot temperature 6800 pounds fifth wheel with 4.6 manuel, 410 gear

wde3477

No experience with this particular code, I'm stuck in the days of 2-digit codes read with a blinky light analyzer. :-)~ You might try a search engine like Google. I typed in 'p0401 egr' and this was the first link shown. Seems to have a fairly thorough 'how-to' troubleshooting guide.
http://www.obd-codes.com/trouble_cod...n-flow-egr.php

F150 Driver

Ok lisen up shade-tree mechs. I did EVERYTHING short of changing out the O2 sensors and the CATS and the "Check Engine" light still popped on. Low and behold it was a vacuum leak. Check behind the battery (most common place) for a leak. Mine was where the three vacuum lines gang together. The black line had a pin hole. This cleared my P0401 EGR Deficiency Code and it also repaired my air conditioner. My A/C would blow on defrost when I accelerated. Now the air comes out the panel vents like it's suppose to when I accelerate. Keep in mind I blew the cash on a new DPFE, EGR, etc and didn't have to. The vacuum control for the EGR also is connected to the A/C vacuum line. I hope this helps and you guys have been wonderful. Thank you and Godspeed !

torkum

Because you have a 4.6 clean the two EGR ports in the throttle body elbow. Take the elbow off and you will see the 2 passages that go to the EGR.

sparkeyscott

The two holes from egr in throttle body elbows are they the same for a 5.4 v8

Onewhite1997

F f150 driver is right on the money I did that it was all good!

alters1did

Oh man I hope this works.. I'll inform if it works.. 1997 Ford f150 4.6 2wd lariat ext cab.

Jbrew

Lots of bad info in this old thread lol. User [MENTION=872]torkum[/MENTION] nailed it tho. It's the most common (for the 4.6L's only). 2nd most common is the DPFE sensor itself.