Operator`s manual

OBD II 293
OXYGEN SENSOR MONITORING TEST RESULTS
Press 6 to select <O2S TEST RESULTS> from the <OBD II FUNCTIONS> menu. The
Oxygen Sensor (O2S) Monitoring Test Results displays the results of the oxygen sensor
testing performed by the vehicle's engine controller. O2S Test Results is also referred to as
OBD II Mode 5. These tests are “once per trip” tests performed after the ignition is turned
on and the vehicle is operated under conditions defined by the manufacturer. The <O2S
Test Results> mode is not available for all vehicles. Some vehicles use the Non-
Continuous Test Results mode to report results of O2S testing.
A warning message indicating that the <O2S TEST RESULTS> may be inaccurate means
the vehicle ECU is reporting that O2S tests have not been completed. The status of the
oxygen sensor tests can be monitored using <Readiness Tests>. For some vehicles, O2S
test results may not be available until all Readiness Tests have been completed.