I have a p0400diagnostic code egr. what dose this mean I've just bought the manual but I cant find it ford focus 06

Code P042E means that your EGR valve is stuck open. You can clean the EGR valves but if it is stuck open it means it is pretty contaminated. Better off replacing it. Not that expensive.

Hi! I think I have a solution to your problem at Ford Focus 2000 2007 Factory Workshop Service Manual

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

Did you disconnect the rod from the brake pedal to the booster?

Are the hoses to the dpfe clear & not a problem?

Is the egr valve working?

May need to look at scan tool data, for not only
the codes, but voltages from the sensor

Check wire connector pins?

TSB 7/2006
Subject/Concern: Hesitations; Poor or no start; Deteriorated fuel economy; Diagnostic trouble codes (DTC) P1412, P0490 and P1335 stored
Model: Focus C-MAX 2003.75 (06/2003?¿½) Build Date: 14.02.2004-01.03.2006
Build Code: 4R-6S
Assembly Plant: Saarlouis
Engine: 2.0L Duratorq-TDCi (DW) Diesel
Focus 2004.75 (07/2004?¿½) Build Date: Up to 01.03.2006
Build Code: Up to 6S
Assembly Plant: Saarlouis
Assembly Plant: Valencia
Engine: 2.0L Duratorq-TDCi (DW) Diesel
Markets: All
Section: 303-08
Summary


Should a customer express concern about one of the following:


* hesitations,
* poor or no start,
* deteriorated fuel economy,
and upon investigation diagnostic trouble codes (DTC) P1412, P0490 and P1335 are stored in the powertrain control module (PCM), the probable cause is a sticky exhaust gas recirculation (EGR) valve.


To rectify this concern, a new EGR valve with a stronger EGR valve motor and revised PCM calibration should be installed.

You must take this to a Ford approved repair center for Ford car audio, they do not sell parts or repair manuals to the general public.

PO401: EGR insufficient flow detected
PO402: EGR excessive flow detected

A code P0402 most likely means one or more of the following has happened:

The DPFE (differential pressure) sensor is faulty and needs to be replaced
There is a blockage in the EGR (most likely carbon buildup)
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum

if you have the radio manual for the car its in there if not call the dealer and have the vin number ready

PO401 is EGR flow insufficent. Replace the EGR valve.