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.
Did this ever get resolved?
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