S6 Fault codes

bigmoose

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Please could someone assist me in telling me what the below fault means and the best way of rectifying it.

17819 P1411 035 Bank 2, secondary air system through flow too low.

Also, could someone with an S6 please advise as to what the average mpg I should be expecting from this with a mixtire of spirited and normal drivig conditions.

Thank you

Alex