What does an oxygen sensor do?

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What does an oxygen sensor do?

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Mitsubishi Forum >> Mitsubishi Models >> Mitsubishi Montero & Montero Sport >> What does an oxygen sensor do?

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What does an oxygen sensor do? - 8/1/2007 8:05:23 PM

crow

Posts: 18
Joined: 6/27/2007
Status: offline

Hi guys,

I recently replaced my servo on my 99 montero sport ltd and two days ago my service engine light is on i had it checked and was diagnosed of an oxygen sensor error but dealer tols me not to worry about i so now i would like to know what it really does...

Thanks in advance!
Charlz

Post #: 1

RE: What does an oxygen sensor do? - 8/1/2007 11:26:14 PM

silvercoupe97

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Joined: 11/10/2006
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It depends on which one you're talking about. Some motors have 2 some have 4...are there any with more than that, perhaps 5? Anyway, there's an upstream and downstream. The upstream tells the computer if the motor is running lean or rich and will adjust the air fuel ratio accordingly. Then there's the downstream which only monitors the cat and that's it. The downstream does not affect motor performance, only the upstream.

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(in reply to crow)

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RE: What does an oxygen sensor do? - 8/1/2007 11:33:37 PM

Joshewuhh

Posts: 1734
Joined: 1/11/2007
From: Hammond, LA
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To what silver said, but in a nutshell.
The O2 sensor basically sends a readout to the ecu/pcm/whatever about how rich (too much fuel) or lean (not enough fuel) your vehicle is running.
It bases these reading on the exhaust gases flowing through the exhaust system.
Obviously, if it detects a problem, it tries to adjust the fuel/air mixture to correct it, but if it can't then you get a check engine light.
And if the O2 sensor goes out, you also get a CEL.

Boy.... some nutshell.

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RE: What does an oxygen sensor do? - 8/2/2007 7:40:39 PM

crow

Posts: 18
Joined: 6/27/2007
Status: offline

quote:

ORIGINAL: Joshewuhh

To what silver said, but in a nutshell.
The O2 sensor basically sends a readout to the ecu/pcm/whatever about how rich (too much fuel) or lean (not enough fuel) your vehicle is running.
It bases these reading on the exhaust gases flowing through the exhaust system.
Obviously, if it detects a problem, it tries to adjust the fuel/air mixture to correct it, but if it can't then you get a check engine light.
And if the O2 sensor goes out, you also get a CEL.

Boy.... some nutshell.

What is CEL?

(in reply to Joshewuhh)

Post #: 4

RE: What does an oxygen sensor do? - 8/2/2007 8:13:34 PM

Dusty Eclipse

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Check Engine Light.... all these acronyms can be found on the acronyms thread...

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RE: What does an oxygen sensor do? - 8/6/2007 9:05:27 PM

crow

Posts: 18
Joined: 6/27/2007
Status: offline

My montero hesitates during acceleration after a full stop could it be because of a malfuntioning oxygen sensor?

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Post #: 6

RE: What does an oxygen sensor do? - 8/7/2007 7:24:47 AM

carlover626

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Joined: 2/2/2007
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A failing oxygen sensor should illuminate the Check Engine Light, has the light been back on since the dealer looked at it? As far as maintenance have you been changing the air filter / fuel filter / PCV valve / spark plugs as needed?

I wonder if you just need to catch up on some maintenance items?

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RE: What does an oxygen sensor do? - 8/7/2007 6:32:32 PM

crow

Posts: 18
Joined: 6/27/2007
Status: offline

The CEL light has now been off but i still have that sort of mild engine hesitation during acceleration..i recently changed sparkplugs air filter is also good, what else could be causing this?

Parts here for a US version montero sport is hard to find i actually got the servo from australia..

(in reply to carlover626)

Post #: 8