DTC P1231: Throttle Position Sensor 1 and 2 Circuit Sum Out of Range (No Limp Home): Notes

WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

Brief disturbances in the throttle valve control which causes the engine to surge.

Fig 1: Identifying Throttle Position Sensor 1 And 2 Circuit Diagram - Sum Out Of Range (No Limp Home)

Courtesy of SAAB-SCANIA OF AMERICA, INC.