Electrical Change-Over Valve for Air Injection
 

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

Look at the diagram
 

on this page
diagram of SAI system

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