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P0401 - EGR flow insufficient – HOW TO…

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Old 01-11-12, 07:09 PM
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Arontee
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You are a savior!! Thanks for the Help!!!
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Old 04-08-12, 07:21 PM
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I've found same part on rockauto.com Dorman part #911609
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Old 04-10-12, 06:55 PM
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Checked both EGR and modulator, both are in working condition but I still have P0401
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Old 04-21-12, 02:13 PM
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On our es300 it was VSV that sits on top of charcoal canister. It got clogged somehow. I took it off and blew air through ports and it unclogged it.
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Old 04-21-12, 03:28 PM
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Originally Posted by mitmaks
Checked both EGR and modulator, both are in working condition but I still have P0401
The is an EGR VSV that controls vacuum flow through the EGR modulator then through the EGR. check the EGR VSV located below the cover near middle.
Last edited by GS4_Fiend; 05-06-12 at 12:10 PM.
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Old 04-28-12, 11:02 AM
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Originally Posted by GS4_Fiend
The is an EGR VSV that controls vacuum flow through the EGR modulator then through the EGR. check the EGR VSV located below the cover on the left side.
by left side you mean passenger side? Then it's right side
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Old 04-28-12, 12:12 PM
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I've taken off VSV that was on top of canister and it seemed to be plugged. I blew air through it and checked that it works. I've reinstalled back on the car and P0401 code hasn't been back on for 4 or 5 days, then it came back on. I've ordered part online and will replace this vsv and see if it will cure the problem.
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Old 04-28-12, 12:18 PM
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Originally Posted by mitmaks
by left side you mean passenger side? Then it's right side
Its actually near the middle. Just follow the egr line to the vsv.
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Old 05-06-12, 09:51 AM
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Originally Posted by GS4_Fiend
The is an EGR VSV that controls vacuum flow through the EGR modulator then through the EGR. check the EGR VSV located below the cover on the left side.
I can't get cover off, seems like bolts are stripped. What's the best way to get this cover off?
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Old 05-06-12, 12:09 PM
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Originally Posted by mitmaks
I can't get cover off, seems like bolts are stripped. What's the best way to get this cover off?
They are not stripped. you need to use torx screw to remove them
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Old 05-06-12, 01:40 PM
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Originally Posted by GS4_Fiend
They are not stripped. you need to use torx screw to remove them
You wouldn't know which particular one, ie T10, etc.
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Old 06-28-12, 07:41 PM
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Originally Posted by GS4_Fiend
They are not stripped. you need to use torx screw to remove them
It's actually supposed to be 8mm allen wrench
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Old 04-10-13, 09:11 AM
  #43  
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Rock Auto has it for under $ 20.00
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Old 04-10-13, 09:14 AM
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Originally Posted by ebnub
Thanks again pon-alex, I just replaced the vacuum modulator after testing it and the CEL seems to be gone for good.

Just for reference:
Auto Zone had it for ~$78 but they had to look it up for a Camry V6, it wouldn't show up under an ES300 at all.
ROCK AUTO PARTS sells the modulator for under $ 20.00
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Old 04-10-13, 10:01 AM
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I had a few 1mz's with that code and it was always the modulators. Going to the junk yard and seeing them missing off all the motors should tell you something
Last edited by msekanha; 04-10-13 at 10:05 AM.
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