User guide

AutoEnginuity ScanTool User Guide 27
O2 Sensors
The O2 Sensors window is used to show oxygen sensor spe-
cific data and test results. Like the Live Data Graph, O2 Sensors
allows you to show oxygen sensor voltage and fuel trim plotting.
What O2 Sensors adds, is the ability, if supported by your vehicle,
to look at the plot with a sample of what the oxygen sensor switch-
ing should look like.
In the lower left corner of the window, the Oxygen Sensor Test
Results are shown. This is data retrieved from your vehicle’s com-
puter and used to determine the oxygen sensors influence on the
computation of fuel trim. If your vehicle doesn’t support displaying
these values, then Unavailable will be displayed. Unavailable
doesn’t mean the test isn’t performed, it means that the test/thresh-
old value isn’t available to be read by any OBD-II scan tool.
In the lower right corner of the window, is a sample voltage
plot showing a good pre-catalytic convertor oxygen sensor. The
Most 2001 and newer vehicles will support this
feature. Previous model years selectively
implemented this optional feature.