P1131: O2S - Switch Point - Lean, Sensor 1: Dependents
WARNING: This page is about a different car, the 2002 Saab 9-5 and 2001 Saab 9-5. However, it is still accessible from the selected car via links, so may be relevant.
DTCs P0115, P0116, P0117, P0118, P0119, P0131, P0132 and P0134.