1997 Chevrolet Lumina Logo
mike
mike Posted on Oct 16, 2010
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I have a 1997 chevy lumina. i had 2 coded before, po420 and po401. i changed the egr valve, and now the po420 is gone. i just replaced the egr tube, cleared the codes, and now the po401 is back. car sounds better, but i wanna get the code and service engine line off. any ideas?

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  • Posted on Oct 16, 2010
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Well, the po401 is saying is that the egr valve has restricted flow. After changing the egr and the tube, something else is causing the restriction. a more thorough diagnosis is recommended. The po420 code sounds like a possible catalyst failure or an o2 sensor failure.

  • mike Oct 16, 2010

    i don't have the po420 anymore since i replaced the egr valve. i just want the po401 repaired now.

  • Anonymous Oct 16, 2010

    Have the scanner hooked back up and see what the code stands for again. It sounds like something more might be causing that code to reappear. You are going to have to go deeper into the diagnosis to see why that code keeps appearing.

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P1443,p0401 and po420 failed emission
P1443 is an EVAP code which means the purge control solenoid.P0401 is an EGR valve and code p0420 is a catalytic converter.
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Code po401
A code P0401 most likely means one or more of the following has happened:
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  • There is a blockage in the EGR (tube), most likely carbon buildup
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Possible SolutionsIn 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'sicon1.png & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
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  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
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Can someone please help me???? i keep getting code po401, insufficient egr flow. i have replaced the catalytic converter, egr valve, egr tube, and have tried running cleaner through. it sounds a little...
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Nov 19, 2010 • 1997 Chevrolet Lumina
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Can someone please help me figure out why i have a po401 diagnstic code? i have already changed the egr valve and egr tube. what can it be? it's killing my gas mileage.
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I have a 97 chevy lumina ls car. i am getting the code po401. i have brainstormed around the egr area, but haven't solved it yet. what do you think the problem is?
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This is a common problem where carbon builds up and causes a code to trip.

A DTC trouble code P0401 which is insufficient EGR (exhaust gas recirculation) flow.
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Oct 09, 2010 • 1997 Chevrolet Lumina
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OBD code P04001 Insufficient flow, I changed the
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Oct 20, 2009 • 1997 Chevrolet Lumina
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Visit http://www.troublecodes.net/OBD2/

and Visit www.repairpal.com
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I have a 1997 chevy lumina ls. the service engine light comes on, and when i hooked up diagnostics, i got the code p0401. i cross checked it and it said it was insufficient air flow or something. what is...
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You either may need to change the valve, or the tube connecting to the valve, or the sensor
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Sep 24, 2009 • 1997 Chevrolet Lumina
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Po401 and po420 (95 toyota previa Van super charged engine)
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Check for

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intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
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Check for loose or no connected vacuum hose(s).


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

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You will need Seafoam or WD-40 and LOT OF TIME to clean out this tube.

A vacuum will help speed up the cleaning.


Please post more information on the comment window.


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