SAI problems

[^adam^]

17831 - Secondary Air Injection System; Bank 1
P1423 - 002 - Insufficient Flow - MIL ON
17819 - Secondary Air Injection System; Bank 2
P1411 - 002 - Insufficient Flow - MIL ON
Readiness: 0000 0100

2004 S4 Auto

Have the above codes, Ross Tech suggests:

Possible Causes

• Fuse for Secondary Air Injection Pump blown
• Vacuum Hose(s) leaky or collapsed
• Piping between Secondary Air Injection Pump and Combi (Secondary Air Injection) Valve leaking
• Secondary Air Injection Solenoid(s) faulty
• Combi Valve(s) faulty

Any ideas on where to start with this? I've checked the fuse, all OK, I guess next easiest are the hoses? Where is the above located?

Thanks

 

[Ovid]

you should be able to hear the pump run for about 30 secs when you start the car it sounds sorta deep