One problem related to o2 sensor has been reported for the 1997 Cadillac Catera. The most recently reported issues are listed below.
Contact complained about electrical problems. When the hazard lights were on, all the gauges started jumping around, when the headlight switch was pushed forward the headlights stayed on for about an hour or longer. Also, when the key was out of the ignition. After the vehicle was restarted and the control is pulled back the headlights functioned normally, the air condition controls did not work, and the O2 sensor did not respond. The spark plugs and wires havd been replaced.