error code 133 on 2000 Saturn

I have a 2000 Saturn the error code I have is that a OS sensor is weak, but were is it located at, oh by the way its a 4 cyl. eng ....

You'll have better luck posting this to the appropriate Saturn forum rather than the Ford Taurus forum. When you post to the Saturn forum, I'd suggest you include the code number as well as particulars on the car (model and if it is the DOHC or SOHC engine).

Your Saturn should have two O2 sensors, one before and one after the catalytic converter. Does the code you saw metion Bank 1, Sensor 1 or Bank 1, Sensor 2? Sensor 1 should be before the converter and sensor 2 will be after the converter. The O2 sensors will resemble a spark plug screwed into the exhust with a cluster of 3 or 4 small wires coming out of it.

-Rod