Just purchased a 2001 A6 2.7T with 50k on it. I'm getting these fault codes from VAG-COM. Any insight?

Thanks!

Address 01 -------------------------------------------------------
Controller: 4B0 907 551 L
Component: 2.7l V6/5VT G01 0004
Coding: 06752
Shop #: WSC 08221
3 Faults Found:
17521 - Oxygen (Lambda) Sensor: B1 S1: Internal Resistance too High
P1113 - 35-10 - - - Intermittent
17831 - Secondary Air Injection System: Bank 1: Insufficient Flow
P1423 - 35-10 - - - Intermittent
17539 - Oxygen (Lambda) Sensor: B2 S1: Internal Resistance too High
P1131 - 35-10 - - - Intermittent
Readiness: 0000 0000

Anyone?

http://forums.audiworld.com/vag/msgs/2979.phtml
http://forums.audiworld.com/s4/msgs/740831.phtml