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  1. #1
    Join Date
    Oct 2010
    Location
    Rockland, NY
    Posts
    180
    My Cars
    2007 328xi

    Service Engine Soon: P0491 Secondary Air Flow

    Hi all,

    I have a 2004 3.0 X5 and SES popped on today. Had it read at autozone and got the code: P0491 secondary air flow. Did some research, some people seemed to have DIY easy fix and some were some intense carbon build ups.. Anyone have this done? It is only the P0491 code showing.

    Thank you!

  2. #2
    Join Date
    Jan 2018
    Location
    Florida
    Posts
    28
    My Cars
    2003 745 Li
    Quote Originally Posted by BmwX504 View Post
    Hi all,

    I have a 2004 3.0 X5 and SES popped on today. Had it read at autozone and got the code: P0491 secondary air flow. Did some research, some people seemed to have DIY easy fix and some were some intense carbon build ups.. Anyone have this done? It is only the P0491 code showing.

    Thank you!


    Ran across your post on a right side panel of this site. I just posted a similar question on the Seven series, 2003, E65/E66 forum. I am not familiar with your car but if your system is similar to mine first eliminate the air pump itself. Most probably it is the chambers/ports inside the heads which are clogged. Bad JuJu. Please have a look at my post and let me know what you think.

  3. #3
    Join Date
    Jan 2009
    Location
    Kent, WA
    Posts
    94
    My Cars
    E46, E53, E60, E92
    Did this ever get resolved?

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