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Shell so air can enter the sensor, but newer style O2 sensors "breathe" through Older style oxygen sensors actually have a small hole in the body Inside of the bulb is vented internally through the sensor body to the outsideĪtmosphere. The outside of the bulb is exposed to the hot gases in the exhaust while the Platinum that serve as electrodes or contacts. The exhaust manifold is a zirconium ceramic bulb. Inside the vented cover on the end of the sensor that screws into
FAST 1.0 O2 GENERATOR
The O2 sensor works like a miniature generator and produces its own voltage when A bad coolant sensor can also prevent the system from going intoĬlosed loop because the computer also considers engine coolant temperature whenĭeciding whether or not to go into closed loop. The engine will run too rich causing an increase in fuel consumption andĮmissions. Temperature, or drops out of closed loop because the O2 sensor’s signal is lost, If the engine fails to go into closed loop when the O2 sensor reaches operating This is referred to as "open loop" operationīecause no input is used from the O2 sensor to regulate the fuel mixture. Is first started (or the 02 sensor fails), the computer orders a fixed When no signal is received from the O2 sensor, as is the case when a cold engine Keeping the average overall fuel mixture in proper balance to minimizeĮmissions. Lean which allows the catalytic converter to operate at peak efficiency while The result is a constant flip-flop back and forth from rich to Loop" operation because the computer is using the O2 sensor’s input to regulate This produces aĬorresponding change in the O2 sensor reading. Is referred to as the fuel "feedback control loop." The computer takes its cuesįrom the O2 sensor and responds by changing the fuel mixture. The computer uses the oxygen sensor’s input to regulate the fuel mixture, which Sensor can throw the whole system out of whack. To monitor these factors, too, but the O2 sensor is the master monitor for Pressure, throttle position, air flow and engine load. Mixture, including air temperature, engine coolant temperature, barometric It tells theĬomputer if the fuel mixture is burning rich (less oxygen) or lean (moreĪ lot of factors can affect the relative richness or leanness of the fuel Levels in the exhaust is a way of gauging the fuel mixture. Oxygen is in the exhaust as the exhaust exits the engine. The O2 sensor is mounted in the exhaust manifold to monitor how much unburned Newer vehicles), many vehicles are now equipped with multiple O2 sensors, some
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And now that OBD-II regulations are here (1996 and Got them next in 1980 when California’s emission rules required lower emissions.įederal emission laws made O2 sensors virtually mandatory on all cars and light The first O2 sensor was introduced in 1976 on a Volvo 240. To as the "O2" sensor because O2 is the chemical formula for oxygen (oxygenĪtoms always travel in pairs, never alone). One of the key sensors in this system is the oxygen sensor. Increased fuel consumption and emission failures can result. The sensors must provide accurate information otherwise driveability problems, Sensors to regulate engine performance, emissions and other important functions.
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Today’s computerized engine control systems rely on inputs from a variety of WHAT THE HOME MECHANIC NEEDS TO KNOW ABOUT O2 SENSORS