Posts Tagged: wideband air fuel ratio sensor

The Oxygen Sensor Monitor Explained

The Fastest Way to Complete an Oxygen Sensor Monitor Drive Cycle Quick Summary: An oxygen sensor monitor in an OBD-II system is a built-in self-test that checks whether the engine’s oxygen sensors are working properly and responding as they should. The oxygen sensor monitor only runs under specific conditions: • No major fuel trim or misfire faults present • The ECM detects that the oxygen sensor’s heater is working • Engine fully warmed up • Stable speed and loadIf those conditions aren’t met, the monitor may show “Not Ready,” which … Read More