Question about 1999 Isuzu Trooper

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I failed smog test it said exhaust gas recirulation not detected. i replaced the egr valve then cleared the code drove it for a day and the code came back. what could this be

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  • yadayada
    yadayada May 20, 2011

    What is the code?

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  • Isuzu Master
  • 22,156 Answers

Best advice is to make a coca cola can gasket and block it off completely ,then no more hassle ,was this device fitted to cars from teh 60s ?? try the multi plug connection the pins could be corroded

Posted on May 20, 2011

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1 Answer

1983 Ford Ecoline 150 /6cyl. Failed smog/ Egr numbers were too high How can i fix this to pass smog


Other than testing the EGR valve, not many options. You really need a 4 gas analyzer to know what is coming out of the tailpipe. Otherwise you won't know if repairs have helped the problem.
When you say EGR numbers I'm not sure what you mean. Most of the time the test is for CO and HC gases, along with oxygen and Nox also in some areas. The EGR valve allows some exhaust gas to be recycled thru the engine and reburned. CO or HC could be high if the EGR system is not working.

Feb 06, 2015 | Ford Cars & Trucks

1 Answer

Hi, I have a Mitsubishi Diamante ES2004 love my car. My engine light came on so I took it in for Diagnosis test. The trouble code p0401, which means exhaust gas recirculation flow insufficient detected....


It doesn't work quit that simply

You have all the items listed, that you need to be
familar with & know how to test

Only then-- if one of those items fails a test-- do you replace it

So you need a repair shop

Way to complicated-- even for some professional
mechanics just starting out--- or not up to speed

Dec 08, 2012 | 2004 Mitsubishi Diamante

2 Answers

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

Ford explorer sportrac evap and catalyst not ready problem how to fix it?


One possible issue is a faulty thermostat. If the engine is not getting up to normal temp the emissions system will not go into closed loop.
I know its hot in Nevada now so thats just a suggestion.
The O2 sensors have heaters to make the exhaust gas hot quick so that the sensors can work.
Is the check engine light coming on - or is it just that the exhaust gas is not hot enough for the test equipment ?

Aug 09, 2012 | 2002 Ford Explorer

2 Answers

I have a code P0401. What is this and how can I fix it?


P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

Mar 20, 2011 | 1998 Ford Taurus

3 Answers

96 ford explorer failed emissions test with codes p0401,p0402,p0755,p0756


P0401
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 EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

P0402
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.

There sound like a bad EGR and need replace it.

P0755 Shift Solenoid B Malfunction and P0756 Shift Solenoid B Performance or Stuck Off. First I suggtes check leve fluids and preventive maintenance.

Tell us news.

Sep 02, 2010 | Ford Explorer Cars & Trucks

1 Answer

I have a 1998 dodge stratus and the code 403 egr flow cicuit malfunction comes up how can i fix this problem so i can pass inspection


Check all vacuum lines to the EGR valve, the EGR valve is between the intake and the exhaust, EGR stands for Exhaust Gas Recirulator valve. It must be able to flow properly in order to pass emissions anyway if they do a smog test.

Jun 25, 2010 | Cars & Trucks

2 Answers

I am at my wits end with this check engine po401 exhaust-gas recirculation and differential pressure. I have replaced the EGR valve and within a couple of miles it came back on. I have a OB2 reader and...


Okay...Ready? Remove the EGR valve and clean the throttle passages. They have to be relatively spotless. It's still reliable, just dirty. You're probably not going to believe how much carbon it can hold. All this carbon is restricting the passages. Clean the tubes as best as you can.

How much does elbow grease cost?

Give it a shot and get back to me with a good word. Good luck, but you won't need it.

Mar 03, 2010 | 2000 Ford Expedition

3 Answers

CODE P0401 COMEING UP


I had an OBD II 401 code and fixed it by cleaning out the EGR vacuum line in the intake manifold. I removed teh EGR Valve and the set screw below it. i used a rifle cleaning brush and one length of the rod. Then I replaced teh set screw. I started teh engind and let the vacuum **** some carb cleaner through the front port hole. when it was sucking good I replaced teh EGR valve and reset the codes. That fixed it.8_26_2012_9_39_13_pm.jpg

Feb 12, 2010 | 1999 Isuzu Rodeo

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

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