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.
Most probable cause for DTC is contamination. Check for obvious contamination (oil, fuel or engine coolant) by removing sensor. Identify and correct cause if contaminated. Replace HO2S1.
An intermittent open in signal or ground wire, as well as an inactive sensor, will not set this DTC.