Regarding my "Emission's failure - Volvo" post. I am considering testing my O2 sensor with an oscilloscope (if I can find) or a high impedance multimeter. Question: Wouldn't a failing O2 sensor give poor readings on both idle and driving tests? My tests show only idle failure (see top line):
EDIT: O2 sensor is 10yrs old with 85K miles.
EDIT: O2 sensor is 10yrs old with 85K miles.