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Code p0402 checked all vacum hoses & hoses at cardbon cotainer

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Not the EVAP System

EGR Valve stuck open

Posted on Mar 30, 2011


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Code p0402??

Code 402 means the computer has detected flow in the EGR valve when it should be closed.
The valve would need to be checked out.

May 06, 2013 | 2001 Isuzu Rodeo

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The engine light on our 1986 Mercury Grand Marquis came on and stayed on. When checked, a code of 34 comes on. What does this code mean?

code 34 means you are not getting any egr flow. find your egr valve and check to see if vacume hose is attached, if so follow the hose to the egr solenoid which should have that hose and a direct vac hose going to it. and an electrical connector. make sure all of these things are in place and not disconected or broken. the most likely cause is either a broken vacume hose or a clogged intake manifold.

Jul 10, 2010 | 1986 Mercury Grand Marquis

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Service engine code P0402 for Ford Mustang

P0402 OBD-II Trouble Code - Exhaust Gas Recirculation Flow (EGR) Excessive Detected

What does that mean?
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor (DPF). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0402 code means that OBD detected an excessive amount of EGR.

You may notice drivability problems such as the engine may surge off idle. There may also be other symptoms.

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

Possible Solutions
With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
* Check the voltage at the DPFE sensor both at idle and when the EGR is open
* Replace the DPFE sensor

Hope helps (remember rated and comment this).

May 27, 2010 | 2001 Ford Mustang

3 Answers

I have a 99 f150 that has a code showing its p0402 egr valve excessive flow the engine is a 5.4 how do i fix it

First make sure all lines are connected to EGR , if not ,connect them if they are? Then remove EGR value and clean and reconnect.

Jan 24, 2010 | 1999 Ford F150 Regular Cab

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1998 corvette, A/C blows out the defroster but not out the face vents..

I think you have a vacum problem. Check the vacum hose that, I think starts at the rear of the intake manafold
that hose will pass through the fire wall. Check to be sure
that the hose is not split or BENT stopping the vacumn
from getting to the A/C & Heater system.
Part of the job of that hose is to open & close the vents
air direction.

Nov 07, 2009 | 1998 Chevrolet Corvette

2 Answers

My check engine light on,i had it check at autozone

i know it sounds reduntant but now you need 2 return to autozone and have it rescaned and old codes cleared

Oct 06, 2009 | Nissan Altima Cars & Trucks

1 Answer

Check engine light on-had checked-code P0402-garage suggested repair- replace EGR Valve,Solinoid, and hose assembly.$600+ cost. Is all of that necessary? Alternatives?

most likely all is not neccesary, sounds like they dont know what the prob. is so they want to replace every thing... i would try another garage

Jun 03, 2009 | 1995 Ford Ranger Supercab

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2000 toyota camry v6 code p0402

most of the time i see this code you want to check the vacume switching valve for the egr ,i hardly see it where the egr is the issue you may want a mechanic to check this you can check it yourself but you would need toyota diagnostic specific info where you would need to apply voltage to the sensor and check the operation of the valve restricting or letting air flow hope this helps

Apr 28, 2009 | 1998 Toyota Avalon

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