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Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 23040
Experience:  BMW Expert
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I got two codes that want past they are P0491&P0492

Customer Question

I got two codes that want past they are P0491&P0492
Submitted: 4 months ago.
Category: BMW
Expert:  Steve replied 4 months ago.
What does want past mean?
Customer: replied 4 months ago.
It to past insection
Expert:  Steve replied 4 months ago.

what has been done so far?

Customer: replied 4 months ago.
They stopping it from pasting inspection
Expert:  Steve replied 4 months ago.

what have you tried to do to correct it?

Customer: replied 4 months ago.
Try new secondary air pump and gas cap, filter
Customer: replied 4 months ago.
Drove it 300miles
Expert:  Steve replied 4 months ago.

I will provide an honest answer. I trust this will be appreciated. Please remember that a low rating PUNISHES me for being honest and that I receive nothing for my time until a positive rating is clicked.
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Thank you for your attention to the rating requirement.

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the problem is that the air passages in the cylinder heads are clogged and need to be cleaned out. you can try this tool http://www.agatools.com/tool/n62-secondary-air-cleaner but usually the heads need to be removed and sent to a machine shop to be cleaned out.
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Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.