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The ECU will cycle the Mixture from rich to lean during normal Driving.. The O2 Sensor test, has you count the Cycles of the lamp, during a high idle run. If the cycle is 5 times or more in one minute, then the O2 Sensor being tested is good..This part of the test does not care if the mixture being recorded is rich or lean.. it is just looking for the transition of one to the other.. If you want to know what the mixture is, a Volt meter, or a Lap Top connected to the ECU will display the actual voltage from the sensor, and then you can get a CRUDE estimation of the actual mixture by looking up the voltage on a Table. However.. the mixture is USUALLY always changing, so it's hard to get an accurate graph without actually logging its output along with other sensors.. Cj
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