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Old 05-03-2003, 08:03 PM   #1
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Default What does a good/bad o2 sensor look like?

I'm trying to sell an old o2 sensor, but I don't know if it still has a lot of life left. The car ran good except for a slight stumble 2-3k rpm, though my gas milage slowly got worse. I don't think the first is related to the o2 sensor but I don't know about the gas milage thing. The sensor had very little carbon buildup on it. I just wiped it off with a tissue. It is darkened a little from use. I don't know if this is a good comparison but it does not look like a fouled plug. I don't have a digi cam so I can't take a pic of it. Any help would be greatly appreciated.
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Old 05-03-2003, 08:07 PM   #2
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Default Re: What does a good/bad o2 sensor look like? (scratchline20)

Clean it with a propane torch and re-use. worth a try...
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Old 05-03-2003, 08:20 PM   #3
 
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Default Re: What does a good/bad o2 sensor look like? (4DeepCivic)

they clean themselves if it's heated.
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Old 05-03-2003, 08:30 PM   #4
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Default Re: What does a good/bad o2 sensor look like? (Nameless EJ6)

So there is nothing you can see to tell if it's bad? Can you only tell by performance?
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Old 05-03-2003, 08:40 PM   #5
 
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Default Re: What does a good/bad o2 sensor look like? (scratchline20)

bad ohtwo sensor

Click the image to open in full size.
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Old 05-03-2003, 08:46 PM   #6
 
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Default Re: What does a good/bad o2 sensor look like? (agent marlon)

I have one that is pitch black and works fine.
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Old 05-03-2003, 09:03 PM   #7
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Default Re: What does a good/bad o2 sensor look like? (agent marlon)

Mine looks a little darker than that, but not nearly as much build up on the bottom.
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Old 05-04-2003, 12:36 PM   #8
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Default Re: What does a good/bad o2 sensor look like? (scratchline20)

well basically what he is asking is, what are the syntoms/signs of a bad o2 sensor. How does the car run/act, would it cause his car to stutter between 2-3k, sound familiar to anybody? Im interested to know as well...
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Old 05-04-2003, 01:14 PM   #9
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Default Re: What does a good/bad o2 sensor look like? (volk ce28n)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">A dead sensor will prevent the onboard computer from making the necessary air/fuel corrections, causing the air/fuel mixture to run rich in the "open loop" mode of operation, resulting in much higher fuel consumption and emissions.

An additional consequence of any oxygen sensor failure may be damage to the catalytic converter. A rich operating condition causes the converter to run hotter than normal. If the converter gets hot enough, the catalyst substrate inside may actually melt forming a partial or complete blockage. The result can be a drastic drop in highway performance or stalling because of a buildup of backpressure in the exhaust system</TD></TR></TABLE>
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Old 05-04-2003, 07:00 PM   #10
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Default Re: What does a good/bad o2 sensor look like? (volk ce28n)

I want to know too?
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Old 05-04-2003, 07:30 PM   #11
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Default Re: What does a good/bad o2 sensor look like? (agent marlon)

hey that looks exactally like a good o2 sensor

there is nothing on the outside of the sensor that will give it away that its bad.
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Old 05-04-2003, 07:36 PM   #12
 
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Default Re: What does a good/bad o2 sensor look like? (scratchline20)

There is no way to tell its bad by looks, you have to test it. Use a DC voltmeter. any O2 sensor that generates 0.9 volts or more (when its heated) is good. It doesn't matter what it looks like.
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Old 05-04-2003, 07:59 PM   #13
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Default Re: What does a good/bad o2 sensor look like? (DrasticCRX)

Quote:
Originally Posted by DrasticCRX
There is no way to tell its bad by looks, you have to test it. Use a DC voltmeter. any O2 sensor that generates 0.9 volts or more (when its heated) is good. It doesn't matter what it looks like.
....yes what he said...or you can plug it right up...and the CHECK ENGINE might go out for about 5 seconds...but it will come back on...WHY?? cuz it reads temperature...but yeah...there is no way of telling by just looking at it... Click the image to open in full size.
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Old 05-04-2003, 08:02 PM   #14
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Default Re: What does a good/bad o2 sensor look like? (scratchline20)

So as long as it's not throwing any codes, it's good?
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Old 05-04-2003, 09:29 PM   #15
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Default Re: What does a good/bad o2 sensor look like? (scratchline20)

basically....yes...if the sensor is installed/plugged and no code for it...ur good to go... Click the image to open in full size.
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Old 05-05-2003, 01:23 PM   #16
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Default Re: What does a good/bad o2 sensor look like? (Kool305)

actually no, ive seen o2 sensors that are going bad and have all the signs of a bad o2 sensor (bad gas mileage, really rich) but no CEL.

it sucks, i hate o2 sensors. Click the image to open in full size.
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Old 05-05-2003, 01:47 PM   #17
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Default Re: What does a good/bad o2 sensor look like? (Kool305)

Quote:
Originally Posted by Kool305
....yes what he said...or you can plug it right up...and the CHECK ENGINE might go out for about 5 seconds...but it will come back on...WHY?? cuz it reads temperature...but yeah...there is no way of telling by just looking at it... Click the image to open in full size.
haha thats my wife!! Click the image to open in full size. Click the image to open in full size.
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Old 05-05-2003, 02:14 PM   #18
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Default Re: What does a good/bad o2 sensor look like? (robbieshonda)

3 ways to tell if you have a bad O2 sensor.
1)Running real rich or lean, go check your ecu might be throwing a code!
2)Hesitation in any RPM excluding your inability to control the clutch Click the image to open in full size.
3)Really Bad Gas Mileage
Go try Bosch, they are cheap and get the universal sensor without the plug.
It's cheaper and works the same!

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Old 05-05-2003, 02:16 PM   #19
 
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Default Re: What does a good/bad o2 sensor look like? (scratchline20)

if its got more than 100,000 miles on it its prob. no good
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