Question about 1999 Toyota 4Runner

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Smog check failed due to ezcessive egr flow/ check engine light on.

Egr flow excessive

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The 5vzfe engine it does not have an EGR

Posted on May 25, 2009

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1 Answer

CodeP00400fornissan


Fault codes have 1 letter in them and 4 numbers from 1-9 after the letter. Please recheck and repost..

Apr 19, 2013 | 2002 Mazda Tribute

1 Answer

Mercury sable 1998 WON'T pass smog. Check engine


PO402--EGR Flow Excessive Detected

There are other components besides the
egr valve in that sytem,so you got things to
diagnose there you skipped over

PO443---Evap Control System Canister Purge

Valve Circuit Malfunction


PO1409--EGR Vacuum Regulator Solenoid
Circuit Malfuntion


PO420 & PO430--Catalyst System Efficiency
Below Threshold---Basically worn out exhaust
converters you will need to replace


Advice--take to a repair shop & go thru the entire
car & resolve ALL Issues

Oct 18, 2012 | Cars & Trucks

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2000 Toyota Camry failed smog due to MIL


No all you have to do is buy an new egr valve at your local part store and replace it.

Sep 19, 2012 | 2000 Toyota Camry

1 Answer

My 2006 escape 3.0 idles rough but seems to run smooth down the road.engine light is on and shows code po402 excessive egr flow. engine starts fine when cold, but cranks for about 10 seconds unless you...


P0402 Exhaust Gas Recirculation Flow Excessive 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 vacuum
  • 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

May 04, 2011 | Ford Escape Cars & Trucks

1 Answer

The check engine light is on, the EGR valve has been replaced, code P0401 appears on diagnostic. The engine is 4 cyl DOHC 2 wd. slight exhaust odor at times in vehicle.


Are you reset the stored codes there? The EGR (Exhaust Gas Recirculation) valve controls an engine's emission of smog-causing nitrous oxides, or NOx. Its job is to route a portion of the exhaust gases back into the intake manifold. That lowers combustion temperature to below 2,500 degrees Fahrenheit - the temperature at which NOx gases form.

EGR flow is controlled by the engine's computer, which opens or closes the valve as needed. The EGR system is, for the most part, in the "out of sight, out of mind" category, and typical doesn't require regular maintenance. But if it gets clogged with carbon deposits, you'll see your "check engine" light come on, and a code (perhaps P0401 or P0402 or P0403) will show that there is insufficient flow. That typically results from a vehicle being driven persistently on short trips that don't allow the engine to fully warm up. Flow problems also can be caused by carbon buildup due to failure to change the oil frequently enough.

A clogged EGR valve not only results in higher emissions, it can affect fuel economy and cause rough idling - even serious engine damage. Valves can usually be cleaned, but replacement is often recommended.

About thie generic fault code, I suggtes check this description and tips for solution information: DTC-P0401-Tests (keep in midn that this code applied for alot brands, Hyundai included).

Keep us updated.

Feb 09, 2011 | 2003 Hyundai Santa Fe

1 Answer

Egr trouble light


The EGR Valve and System - it's just three letters, but EGR can result in AGGravation.

Common in automobile emission systems since the early 1970s, the EGR (Exhaust Gas Recirculation) valve controls an engine's emission of smog-causing nitrous oxides, or NOx. Its job is to route a portion of the exhaust gases back into the intake manifold. That lowers combustion temperature to below 2,500 degrees Fahrenheit - the temperature at which NOx gases form.

EGR flow is controlled by the engine's computer, which opens or closes the valve as needed. The EGR system is, for the most part, in the "out of sight, out of mind" category, and typical doesn't require regular maintenance. But if it gets clogged with carbon deposits, you'll see your "check engine" light come on, and a code (perhaps P0401 or P0402 or P0403) will show that there is insufficient flow. That typically results from a vehicle being driven persistently on short trips that don't allow the engine to fully warm up. Flow problems also can be caused by carbon buildup due to failure to change the oil frequently enough.

A clogged EGR valve not only results in higher emissions, it can affect fuel economy and cause rough idling - even serious engine damage. Valves can usually be cleaned, but replacement is often recommended.

A code P0401 most likely means one or more of the following has happened:
* The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (tube), most likely carbon buildup
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions: In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
* Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
* Clean out the EGR valve and/or tubing to remove deposits
* Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
* Replace the DPFE sensor (with a good quality / OEM one)
* Replace the EGR valve

Jan 11, 2011 | 1999 Isuzu Trooper

1 Answer

Check engine light on and the code is p0402 and how to repair that


CODE PO402 EXHAUST GAS RECIRCULATION SYSTEM EXCESSIVE FLOW DETECTED.POSSIBLE CAUSE EGR PIPE IS CLOGGED RESTRICTED.OR EGR SOLENOID VALVE CLOGGED OR FAILED.

Sep 12, 2010 | Pontiac G6 Cars & Trucks

1 Answer

High nox fail smog test any remedies? 99


NOX is created when the internal combustion temperature gets to high.The egr system uses burnt exhaust gases to line to cylinder walls.The purpose of this is decrease internal combustion temperature therefore reducing the amount of NOX created.Would look to a possible egr malfunction usually they will trigger the check engine light but not always.The 4.3L has been known to have issues with carbon buil up in the egr and the egr pintle not open and closing properly.

Jun 07, 2010 | 1999 Chevrolet Astro

1 Answer

01 Ford Expedition. Check Engine light and failed Smog check.


whoever installed the egr valve, if it wasnt you, just cleared the engine codes, thus giving you this problem once again. Get it scanned at autozone, and go from there.

May 18, 2009 | 2001 Ford Expedition

1 Answer

2001 Sonata V6, Smog failed - high NOX


if i were you i would contact cragen and ask them if the car has it and how much the replacement part is

Aug 19, 2008 | 2001 Hyundai Sonata

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