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Steve, BMW Expert
Category: BMW
Satisfied Customers: 23986
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: 1 year ago.
Category: BMW
Expert:  Steve replied 1 year ago.
What does want past mean?
Customer: replied 1 year ago.
It to past insection
Expert:  Steve replied 1 year ago.

what has been done so far?

Customer: replied 1 year ago.
They stopping it from pasting inspection
Expert:  Steve replied 1 year ago.

what have you tried to do to correct it?

Customer: replied 1 year ago.
Try new secondary air pump and gas cap, filter
Customer: replied 1 year ago.
Drove it 300miles
Expert:  Steve replied 1 year 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.
Thank you for your attention to the rating requirement.

the problem is that the air passages in the cylinder heads are clogged and need to be cleaned out. you can try this tool but usually the heads need to be removed and sent to a machine shop to be cleaned out.
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.