Diagnostic Aids
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0122 and P0123 sets if DTC P1120 or P1635 and P1220 are also set. Refer to DTC P1120 or P1220 for diagnosis. See DTC P1120: THROTTLE POSITION SENSOR 1 CIRCUIT or DTC P1220: THROTTLE POSITION SENSOR 2 CIRCUIT .