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Purpose of the....02' Sensor #4838563 08/12/18 09:04 PM
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Oregoonian Offline OP
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What does it accomplish ???

Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838600 08/12/18 09:50 PM
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Stag Offline
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The O2 sensors in a gasoline engine car works with the Engine Control Module to determine the oxygen content of the exhaust. This information is used during closed-loop operation to adjust the fuel injected to make the best charge for the conditions of operation. Except in modern OBD-2 (after 1996, I believe) there is a second O2 sensor behind each cat to monitor "catalyst efficiency".


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Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838602 08/12/18 09:52 PM
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Originally Posted By: Oregoonian
What does it accomplish ???


It senses "02'" of course.

The simple answer is, it tells your fuel injection computer how much fuel to inject.

Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838611 08/12/18 10:07 PM
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Specifically, it is "O2" (2 Oxygen atoms) not "02" (zero two).

Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838612 08/12/18 10:08 PM
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Trav Offline
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It maintains the stoichiometric ratio.

https://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio

There are a few different types of o2 sensors AKA Lambda sensor.

https://o2sensors.com.au/static/what-is-oxygen-sensor


ASE L1, Master. Deutsch Meisterbrief.
Re: Purpose of the....02' Sensor [Re: Reddy45] #4838736 08/13/18 04:44 AM
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Originally Posted By: Reddy45
Specifically, it is "O2" (2 Oxygen atoms) not "02" (zero two).


Being really specific it is O2. grin


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Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838766 08/13/18 05:38 AM
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SOHCman Offline
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It senses if you watch the Oxygen network.


I urge people not to wait 100K to change out the fluid in their transfer case units. -Kestas
Re: Purpose of the....02' Sensor [Re: weasley] #4838770 08/13/18 05:58 AM
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spasm3 Offline
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Originally Posted By: weasley
Originally Posted By: Reddy45
Specifically, it is "O2" (2 Oxygen atoms) not "02" (zero two).


Being really specific it is O2. grin



I can't seem to type that! Did you copy and paste? I end up with O2.

Last edited by spasm3; 08/13/18 05:58 AM.

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Re: Purpose of the....02' Sensor [Re: Trav] #4838774 08/13/18 06:08 AM
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Originally Posted By: Trav
It maintains the stoichiometric ratio.
https://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio
There are a few different types of o2 sensors AKA Lambda sensor.
https://o2sensors.com.au/static/what-is-oxygen-sensor

Very helpful webpage!
I worked on an interface circuit for what sounded very much like a wideband oxygen sensor for a US OEM quite some time ago.
Very delicate little design, had me pulling my hair out for a couple of months...


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Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838787 08/13/18 06:32 AM
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dbias Online Content
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A lot. They help maintain a 14.7 to 1 air to fuel ratio. If O2 is high engine is considered to be running lean so ECU tells injection to add more fuel and the opposite if running rich. Adjustments to the short and long term fuel trims show the ECU trying to maintain the ratio.
Gummed up MAF or unmetered air throw things out of whack


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Re: Purpose of the....02' Sensor [Re: spasm3] #4838798 08/13/18 06:46 AM
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supton Offline
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Originally Posted By: spasm3
Originally Posted By: weasley
Originally Posted By: Reddy45
Specifically, it is "O2" (2 Oxygen atoms) not "02" (zero two).


Being really specific it is O2. grin



I can't seem to type that! Did you copy and paste? I end up with O2.


Hit quick quote on his post and you can see the code.


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Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838808 08/13/18 06:58 AM
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Commonly, O2 sensor is part of a feedback loop for closed loop operation.

Less common is a wide band O2 driving an AFR gauge on the dash and/or helping a new ecu to self-learn.


Cable ties should hold it
Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838843 08/13/18 08:04 AM
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Not exactly 14.7 to 1. The ECU fluctuates the mixture between rich and lean which results in a cleaner exhaust. If you watch the O2 sensor you will see it 'toggle' or switch, many times a second.

Re: Purpose of the....02' Sensor [Re: partspro] #4838885 08/13/18 09:17 AM
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Originally Posted By: partspro
Not exactly 14.7 to 1. The ECU fluctuates the mixture between rich and lean which results in a cleaner exhaust. If you watch the O2 sensor you will see it 'toggle' or switch, many times a second.


Does that for one or two reasons (not completely sure if both are "required"): first, the upstream O2 sensor (the one before the cat) will see that wide swing. But the downstream (after cat) should stay at 14.7:1 if the cat is working properly. Once it starts to swing also, that tells the ECU that the cat efficiency is not as good as it should be. Second reason it may cycle like this is to run rich momentarily and make the cat do more work--by doing so will boost the cat temperature. I doubt this is needed at cruise speed on the highway but at idle it may be necessary to keep the cat hot.


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Re: Purpose of the....02' Sensor [Re: SOHCman] #4838912 08/13/18 09:50 AM
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"It senses if you watch the Oxygen network."

An Oprah sensor?

Last edited by 9050lx; 08/13/18 09:51 AM.
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