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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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