S2000 Under The Hood S2000 Technical and Mechanical discussions.

P0411 Secondary Air System Incorrect Flow

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Old Aug 4, 2021 | 08:12 PM
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Talking P0411 Secondary Air System Incorrect Flow

Hello everyone. Recently after my new clutch and valve clearance spec'd I got my S back from the shop and this code has now came on as well with my intake sounds like its sucking a large amount of air in. Not sure what this problem can be. If anybody can help post what they have done to fix this code I would appreciate it a lot. I will post pictures of the lines that are involved to see if they are not properly connected tmr.
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Old Aug 5, 2021 | 12:35 AM
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Originally Posted by iguti_
Hello everyone. Recently after my new clutch and valve clearance spec'd I got my S back from the shop and this code has now came on as well with my intake sounds like its sucking a large amount of air in. Not sure what this problem can be. If anybody can help post what they have done to fix this code I would appreciate it a lot. I will post pictures of the lines that are involved to see if they are not properly connected tmr.
Secondary air injection is the air pump. Check the hose from the air pump to the intake tube.
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Old Aug 5, 2021 | 05:17 AM
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You have a crossed vac line, guaranteed. When crossed, air hisses out of the vac control valve next to the airbox.
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Old Aug 23, 2021 | 06:32 AM
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Originally Posted by Billman250
You have a crossed vac line, guaranteed. When crossed, air hisses out of the vac control valve next to the airbox.
As a complete non-technical person, can I please ask how do you determine the vac line has been crossed and how can I fix it (by myself if thats possible).?


I broke the internet (google and youtube) and soon the search feature on this forum to learn more about this. The theme I have read so far at a high level is : this is a common error, get a bypass kit if you are not worried about emissions or take it to your mechanic and have it replaced.
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Old Aug 23, 2021 | 06:41 AM
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There is a vac line routing diagram sticker on the underside of the hood. Follow it.

I promise yours are crossed or disconnected.
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Old Aug 23, 2021 | 07:24 AM
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Old Aug 24, 2021 | 04:27 AM
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Originally Posted by Billman250
Billman you help a lot. Will update to see if this solves problem.
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Old Aug 24, 2021 | 07:57 AM
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Originally Posted by iguti_
Billman you help a lot. Will update to see if this solves problem.
He does and I sincerely thank you!
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Old Aug 24, 2021 | 10:23 AM
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Lines 6 and 8 are very commonly left off by accident , and the way they lay they can lay right next to the metal lines and not be noticed. I would start at those two, where they connect to that pair of metal lines
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Old Aug 25, 2021 | 08:13 AM
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Originally Posted by Billman250
There is a vac line routing diagram sticker on the underside of the hood. Follow it.

I promise yours are crossed or disconnected.
THANK YOU AGAIN FOR ALL YOUR EFFORTS FOR THIS COMMUNITY. Somehow, this was disconnected.
Reconnected it, cleared CEL and been driving it like i stole it since I only get a few months here in Chicago

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