Tip & How-To about Ford F-150

Ford 4.6L Engine and P0401 Insufficeint EGR Flow

The P0401 code refers to not enough flow of the EGR system. Most common problem for the Ford 4.6L engine, is the flow ports in the throttle housing. If you have this code, try this procedure first, before spending any money.
First remove the two EGR valve mounting bolts. Leave the pipe connection connected to the valve, then remove the air intake tube to the throttle housing. Next remove the throttle housing from the intake by taking out the screws that hold it in place, and disconnect the throttle linkage.
Remove the housing and turn it over, look at the ports (holes) for the EGR valve, they will most likely be covered with carbon crud. Clean these ports out completely, reinstall the housing and tighten all the bolts, reinstall the linkage and air intake tube. Clear the code with a reader, and test.

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I need to know what the problem the p0401 what is the problem 1999 grand Victoria Ford 4.9


wow I wish ford could make a egr system that wouldn't fail as I've seen this one go a lot lately ! anyways the code is for insufficient flow in the egr system , this is a means to recirculate some of your exhaust back into your intake , as a means to reburn some of your excess fuel (emissions) , anyways it consists of a means to meter some of the exhaust , and control it (off/on) also to measure the amount that goes in , its part of the closed loop of the fuel inlet system , the fault code is specifically saying flow sensor cant detect any flow in the pipe , there can be a few causes for this including a bad flow sensor , all are from my opinion a poorly designed system (it doesn't self clean it's self ) as almost a guaranty every 60k miles your gonna have some problem with it

Feb 03, 2016 | Ford Cars & Trucks

2 Answers

why is codes p2106 p0401 on?


P2106 THROTTLE ACTUATOR CONTROL SYSTEM,-PO401-EGR INSUFFICIENT FLOW

May 29, 2014 | 2005 Ford Explorer

1 Answer

engine code p0401 in 2004 ford explorer 4.0 motor insuficient gas flow detected


p0401 is egr flow insufficiant. check or remove and clean egr and port. and also check the vacuum lines to egr. Insufficient EGR flow frequently is caused by clogged EGR passageways.

Aug 19, 2010 | 2004 Ford Explorer

1 Answer

Problems with EGR system


is it code P0401? If so the DPFE sensor is bad. It is the sensor to the EGR valve. Very common

Jul 24, 2010 | 1999 Ford Taurus

2 Answers

MERCURY 2000 ODB2 CODES P0400, P00A0, P0401


P00A0 is a factory readable only code (i.e. only ford dealers have the computer to read it)
the P0400 is a generic E.G.R. flow restriction code. so yes a dvom (multimeter) and a vacuum pump to diagnose it correctly, also check for loose wires as ford harness connectors are known to fail alot due to crappy phenolic content in the plastic and heat combined they can warp and / or corrode the contacts

Sep 19, 2008 | 2000 Mercury Sable

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