I replaced my O2 sensor (upstream) on my 2000 GTP Saturday morning---drove car about 50 miles and Service Engine Light comes on---code P0133----slow response Bank 1 Sensor 1. Thinking I had a bad O2 sensor, I returned it and installed new one. Drove to get gas this morning, car running fine, and on the way home---Service Engine Light back on, code P0133---slow response Bank 1 Sensor 1. No exhaust leaks, no coolant leaks, wires not touching exhaust. I have no idea. Any help would be appreciated. Short scan is attached after filling tank and SEL light came on.