Like it's said, the ECU determines the fuel mixture, the 02 sensor senses a slightly rich (not enough 02) or slightly lean, with the threshold around .6 volts, the sensor will cycle the fuel "trim" up to a dozen times a second. As sensors age they become "lazy" and many will only cycle a couple times a second. Coatings build up with mileage and that's the reason they should be replaced around that 75,000 mile point. A sensor can foul itself quite quickly with an upstream exhaust leak, for example, or restricted cat. The basic reason newer vehicles have multiple O2 sensors, 1 right before and 1 after the cat. The ecu will tell you with a code if the cat is not functioning. If you measure the cycling time of the sensor with a scan tool, it tells you what it's doing. Larry
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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