Electrical Change-Over Valve for Air Injection

[Kimple]

I'm getting code P0413 - Secondary Air Injection System Switching Valve A Circuit Open and the suspect is Electrical Change-Over Valve for Air Injection (996-605-123-01). Where is this located in engine compartment and how do I change this. The part seems to be very cheap itself. I started looking at this because my car Boxster S 2001 failed emission test and one O2 sensor was indeed bad. I changed it, but I want to clear all emission related codes before going to the test again.

Thanks

[mikefocke]

on this page
diagram of SAI system

[Kimple]

So, it's perhaps under the intake manifold on right side? Can it be reached by removing the alternator?