Can anyone shed any light on these codes ?

[bigee]

Didn't intend to make my first post with new ride a question about a problem but then thats how it often is i suppose !
Just purchased A D3 S8 which is (obviously )fantastic...except the dreaded
EML light has come on twice within the first 6 days of ownership. Turned off light 1st time round in case it was somehow spurious but has come on again today so obviously an underlying problem.
The codes are P1497 and P0491 both say "secondary air injection system insufficient air flow " on banks 1 and 2 respectively.
Can anyone shed any light on these ? Is it likely to be the secondary air pump/ leaking pipe etc? Does it sound expensive !!!
Any help be greatly apreciated