Does anyone have information on what an acceptable output voltage range is from the O2 sensors? Also, what should the ratio between the pre-cat/post-cat O2 sensors be (any ideas)??
I've got my car hooked up to read live sensor data and noticed my upper (pre-cat) O2 sensor varied between 0.01-0.4 volts. The O2 sensor after the catalytic converter was more constant - in the 0.4-0.9 volt range.
I think the upper O2 sensor is intermittant but I don't have info on what is an acceptable output range. Any help would be appreciated.
FYI this is a 1998 Mystique Zetec with ~112,000 miles (probably the original 02 sensor too). The car also generated a CEL P1131 code recently (Lean Condition).
