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Purpose of the....02' Sensor #4838563
08/12/18 10:04 PM
08/12/18 10:04 PM
Joined: Feb 2010
Posts: 2,766
Bend, Oregon
Oregoonian Offline OP
Oregoonian  Offline OP

Joined: Feb 2010
Posts: 2,766
Bend, Oregon
What does it accomplish ???

Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838600
08/12/18 10:50 PM
08/12/18 10:50 PM
Joined: Aug 2012
Posts: 54
Northern California
Stag Offline
Stag  Offline

Joined: Aug 2012
Posts: 54
Northern California
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 10:52 PM
08/12/18 10:52 PM
Joined: Dec 2006
Posts: 1,076
midwest
JamesBond Offline
JamesBond  Offline

Joined: Dec 2006
Posts: 1,076
midwest
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 11:07 PM
08/12/18 11:07 PM
Joined: Aug 2008
Posts: 3,673
Oklahoma City
Reddy45 Offline
Reddy45  Offline

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Posts: 3,673
Oklahoma City
Specifically, it is "O2" (2 Oxygen atoms) not "02" (zero two).

Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838612
08/12/18 11:08 PM
08/12/18 11:08 PM
Joined: Nov 2006
Posts: 22,007
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
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MA, Mittelfranken.de
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 05:44 AM
08/13/18 05:44 AM
Joined: Mar 2013
Posts: 873
UK
weasley Offline
weasley  Offline

Joined: Mar 2013
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UK
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 06:38 AM
08/13/18 06:38 AM
Joined: Mar 2010
Posts: 1,424
USA
SOHCman Offline
SOHCman  Offline

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USA
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 06:58 AM
08/13/18 06:58 AM
Joined: May 2010
Posts: 10,253
out there
spasm3 Online content
spasm3  Online Content

Joined: May 2010
Posts: 10,253
out there
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 06:58 AM.

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Re: Purpose of the....02' Sensor [Re: Trav] #4838774
08/13/18 07:08 AM
08/13/18 07:08 AM
Joined: Jun 2015
Posts: 5,353
New England
Virtus_Probi Offline
Virtus_Probi  Offline

Joined: Jun 2015
Posts: 5,353
New England
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 07:32 AM
08/13/18 07:32 AM
Joined: Dec 2014
Posts: 507
Huntington WV
dbias Offline
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Posts: 507
Huntington WV
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 07:46 AM
08/13/18 07:46 AM
Joined: Nov 2008
Posts: 13,958
NH
supton Offline
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Posts: 13,958
NH
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.


2011 Toyota Camry, base, 2.5L/6MT, 187k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 152k, ours
1999 Toyota Camry LE, 2.2L/4AT, 208k, his
Re: Purpose of the....02' Sensor [Re: Oregoonian] #4838808
08/13/18 07:58 AM
08/13/18 07:58 AM
Joined: Dec 2013
Posts: 3,998
Manchester, England
Olas Offline
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Manchester, England
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 09:04 AM
08/13/18 09:04 AM
Joined: Dec 2011
Posts: 196
MO, USA
partspro Offline
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MO, USA
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 10:17 AM
08/13/18 10:17 AM
Joined: Nov 2008
Posts: 13,958
NH
supton Offline
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Joined: Nov 2008
Posts: 13,958
NH
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.


2011 Toyota Camry, base, 2.5L/6MT, 187k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 152k, ours
1999 Toyota Camry LE, 2.2L/4AT, 208k, his
Re: Purpose of the....02' Sensor [Re: SOHCman] #4838912
08/13/18 10:50 AM
08/13/18 10:50 AM
Joined: Nov 2008
Posts: 151
FL
9050lx Offline
9050lx  Offline

Joined: Nov 2008
Posts: 151
FL

"It senses if you watch the Oxygen network."

An Oprah sensor?

Last edited by 9050lx; 08/13/18 10:51 AM.
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