I've got a better question, why is this question in the Chevy venture forum ?
Trouble code P1133 means: HO2S insufficient switching
Trouble code P1133 means: HO2S-11 (Bank 1 Sensor 1) Insufficient Switching
Trouble code P1133 means: HO2S-11 (Bank 1 Sensor 1) Insufficient Switching
change your o2 sensor
HO2S Insufficient Switching Sensor 1
Its the Primary o2 Sensor (pre-cat), needs to be replaced
Trouble code P1133 means:HO2S insufficient switching
Trouble code P1133 means: HO2S insufficient switching
small evap leak, check the fuel cap, if it is not loose, replace it.
The check engine light would come on and the code stored would refer to a bad cat.
knock sensor
You either have a bad oxygen sensor or a vacuum leak. Code P1133 indicates a faulty heated oxygen sensor but a vacuum leak could also cause this code.