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Registered:
May 2004
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Re: Is this possible - telling a bad O2 sensor
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Tue, 11 January 2005 11:04
 
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I mean it should be reading .45v when there is a certain oxygen content
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On the contrary, if your O2 sensor does not oscillate, then you can assume that it is fucked.
An O2 sensor, as a generalisation should fluctuate between 0.1V and 0.9V.
As a basic rule of thumb, O2 sensors are merely mixture trimmers attempting to reach your stoichiometric ratio of 14.7:1.
"Most" cars will run OK with the O2 sensor disconnected, but then again most cars will illuminate the "check engine" lamp if this is disconnected.
Also keep in mind that your O2 sensor only detects the amount of oxygen remaining in the exhaust gas, expressed to the ECU as a percentage of your exhaust gas as a whole.... I hope that made sense.
However, don't be fooled by your stoichiometric ratio of 14.7:1 as keeping you out of trouble. A high performance engine can run in and closely around the perfect "14.7:1", but on the other end your HC's (hydrocarbons) and CO's (carbon monoxides)can be at a highly unacceptable level.
In oreder to answer your question as to whether an O2 sensor can give a false reading,..ofcourse it can. Especially if the readings are not constantly fluctuating.
But generally if your O2 sensor is faulty, it will be one or possibly both of two reasons.
You have contaminated your Titanium or Zirconia composite O2 sensor, or your wiring has failed you.
With contamination, you usually will not get a fluctuating reading, or an incorrect reading.
If there is a wiring problem, your ECU will usually recognise a "no activity" situation, which the ECU will usually log a code!
A "no activity" situation can also occur on a contaminated O2 sensor!
Hope this helped out in some way!
[Updated on: Tue, 11 January 2005 11:10]
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| | Subject | Poster | Date |
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Is this possible - telling a bad O2 sensor
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HighRolla | Tue, 11 January 2005 07:46 |
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Re: Is this possible - telling a bad O2 sensor
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YelloRolla | Tue, 11 January 2005 09:07 |
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Re: Is this possible - telling a bad O2 sensor
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HighRolla | Tue, 11 January 2005 09:26 |
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Re: Is this possible - telling a bad O2 sensor
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Kyosho | Tue, 11 January 2005 09:36 |
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Re: Is this possible - telling a bad O2 sensor
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HighRolla | Tue, 11 January 2005 10:09 |
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Re: Is this possible - telling a bad O2 sensor
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Kyosho | Tue, 11 January 2005 10:23 |
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Re: Is this possible - telling a bad O2 sensor
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colouring_in_book | Tue, 11 January 2005 11:04 |
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Re: Is this possible - telling a bad O2 sensor
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thechuckster | Tue, 11 January 2005 11:27 |
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Re: Is this possible - telling a bad O2 sensor
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HighRolla | Tue, 11 January 2005 11:37 |
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Re: Is this possible - telling a bad O2 sensor
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thechuckster | Tue, 11 January 2005 13:05 |
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Re: Is this possible - telling a bad O2 sensor
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HighRolla | Tue, 11 January 2005 13:13 |
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Re: Is this possible - telling a bad O2 sensor
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Kyosho | Wed, 12 January 2005 05:13 |
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Re: Is this possible - telling a bad O2 sensor
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pannelvan_screema | Fri, 14 January 2005 23:37 |
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Re: Is this possible - telling a bad O2 sensor
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HighRolla | Sat, 15 January 2005 00:30 |
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Re: Is this possible - telling a bad O2 sensor
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colouring_in_book | Sat, 15 January 2005 01:52 |
