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Simply put, an oxygen sensor reacts to oxygen thus creating a voltage as high as 0.9v. The higher the voltage the richer the engine is running. Abnormally high voltage is caused by unburnt oxygen in the system (misfire), abnormally low voltage (vacuum leaks) is a system running with a lack of fuel. An engine running properly will show an upstream (sensor 1) O2 sensor switching from .1 to .9 volts as the computer hunts for the optimal mix or 14.7 parts of air to 1 part of fuel for gasoline engines. The downstream (sensor 2) should show a relatively stable, and lower voltage as these leftover combustion gases are scrubbed through a catalytic converter.
If an oxygen sensor fails, the computer will substitute the O2 signal with a predetermined value. Typically and over rich mixture will be used to protect the engine as damage can occur if running lean, however, prolonged rich mixture can damage the catalytic converter, which can be expensive to replace.
The oxygen sensor is a key component to a fuel injection system. Working in unison with other critical components such as engine coolant temp sensors, air flow sensors, throttle position sensors, these devices prolong engine life, increase fuel efficiency, reduce harmful emissions and have dramatically increased the reliability and ease of use of the modern day engine.

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5mo ago

An oxygen sensor works by measuring the amount of oxygen in a vehicle's exhaust stream. It generates a voltage signal based on this oxygen concentration, which is then used by the engine control unit to adjust the air-fuel ratio for optimal combustion efficiency. This feedback loop helps improve fuel efficiency and reduce harmful emissions.

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Q: How does an oxygen sensor work?
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Is a oxygen sensor a thermistor sensor?

No, an oxygen sensor is not a thermistor sensor. An oxygen sensor measures the amount of oxygen in the exhaust gases of a vehicle to help determine the air-fuel ratio. A thermistor sensor, on the other hand, is a type of temperature sensor that relies on the change in resistance with temperature to measure temperature.


instrument used to measure oxygen gas?

An oxygen sensor is typically used to measure the concentration of oxygen in a gas. These sensors can be found in various devices such as oxygen analyzers, medical equipment, and industrial gas detectors. They work by generating an electrical signal in response to the presence of oxygen molecules.


What equipment is used to measure dissolved oxygen?

Equipment such as a dissolved oxygen meter or a probe with a sensor is typically used to measure dissolved oxygen in water. These devices work by measuring the amount of oxygen dissolved in the water, providing a reading in units such as milligrams per liter (mg/L) or parts per million (ppm). Regular calibration and maintenance are important for accurate results.


What is an oxygen sensor made of?

An oxygen sensor is typically made of ceramic zirconia with a thin layer of platinum coating. Some oxygen sensors also use different materials such as titanium dioxide or tantalum oxide as their sensing element. These materials help in detecting the oxygen content in the exhaust gas of a vehicle.


Why oxygen gauge reads use no oil?

If you look closely at a regulator gauge you will see the instructions USE NO OIL. There is a reason for this. If pure oxygen or high pressure gas comes in contact with oil it can ignite and cause a fire.

Related questions

What size resistor needed to fool o2 sensor?

It doesn't work that way. An oxygen sensor can not be bypassed.


Will a Toyota Sienna oxygen sensor from an American car work on a Canadian car?

If the oxygen sensor fits the catalytic coverter and female vehicle port yes


What is the mean heated oxygen sensor not dan?

Oxygen sensors do no work well when they are cold so manufactures have installed a heater in the sensor to get it up to speed quickly.


Where is the locations of oxygen sensor for Mitsubishi Outlander?

There are two oxygen sensor for Mitsubishi Outlander. Front Oxygen Sensor and Rear Oxygen Sensor


What is the work of the O2 sensor?

An O2 sensor is used to check the level oxygen in your blood. On a car it measures the oxygen content of the exhaust to the adjust air/fuel ratio


Do you need a oxygen sensor for headers?

If the vehicle was built with an oxygen sensor, you will need an oxygen sensor.


What causes an 02 heater circuit malfunction on a 2000 Maxima SE?

Newer oxygen sensors are heated for accuracy. If the heater element goes bad the oxygen sensor doesn't work and needs to be replaced. If you have an oxygen sensor heater malfunction, it just means that the oxygen sensor has failed.


What happens when to oxygen sensor does not work anymore?

The vehicles don't run right


How do you check the oxygen sensor on 97 Dodge 318?

Oxygen sensors either work or they don't. If they don't, the check engine light will come on and indicate an oxygen sensor problem. If they're fine, none of that will happen.


Where exactly is the location of your oxygen sensor heater in a 2002 rodeo?

It's integrated into the oxygen sensor. Buy a new oxygen sensor and you get a free oxygen sensor heater.


What is the location of the oxygen sensor Bank 2 Sensor 2005 MAGNUM?

How do I get my magnum remote to work after I changed the battery in it and the doors are locked


Change oxygen sensor on 95 Oldsmobile cutlass ciera?

Remove the oxygen sensor vacuum to. Remove the oxygen sensor screws. Reverse the process to install the new oxygen sensor.