Check out
https://www.renntech.org/topic/50571-986-boxster-error-codes-p1123-p1125/
They discuss that. If you have a Durametric it could be possible to activate the purge valve, I performed that on my 997 to rule out a failure of that valve. Edit: It is clicking when activated
P0326 might be fuel related or something with the sensor itsself. I had a cracked Sensor. You could change the sensors against each other and see if the failure follows, then swap the sensor. You could test wiring/voltage first.