Reference ground
WARNING: This page is about a different car, the 2003 Saab 9-3 and 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
Oxygen sensors 1 and 2 are grounded from control module pin 58.
Oxygen sensors 1 and 2 are grounded from control module pin 58.