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Old 06-28-2014, 08:27 AM   #1
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Whats the real deal with oxygen sensors?


People,

Always hearing that , maybe not on all cars, but some cars need a new O2 sensor even though your car's computer/sensors do not show a code for a faulty one. Is this true, in yours opinions? Have an 01 civic, and has 125,000 miles on it, so far, original sensor. No codes yet for it have been displayed.

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Old 06-28-2014, 08:31 AM   #2
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Whats the real deal with oxygen sensors?


o2 sensors get weaker over time, as long as you have no drivability issues, your fine. and yes faulty o2's may not set a code for the o2 even though the underlying cause of but not limited to, catalyst failure (sulfur smells) misfires, lean conditions (to much air), or rich conditions (to much fuel).

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Old 06-28-2014, 09:15 AM   #3
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Whats the real deal with oxygen sensors?


+1

As long as there are within specifications and are putting out the correct voltages for the computer to adjust the fuel tables, you are fine.
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Old 06-28-2014, 09:15 AM   #4
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Whats the real deal with oxygen sensors?


good to know, naes.
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Old 06-28-2014, 09:17 AM   #5
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Whats the real deal with oxygen sensors?


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+1

As long as there are within specifications and are putting out the correct voltages for the computer to adjust the fuel tables, you are fine.
Thanks, wash, so One just kinda has to assume they are puting out the correct voltages if it doesnt trip a code, right? otherwise, can one measure the voltage with a meter?
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Old 06-28-2014, 09:55 AM   #6
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Whats the real deal with oxygen sensors?


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Thanks, wash, so One just kinda has to assume they are puting out the correct voltages if it doesnt trip a code, right? otherwise, can one measure the voltage with a meter?
Once it is out of range, it will throw and MIL light (i.e. check engine).

No need to check it or replace it until it is failed. Some never fail.
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Old 06-28-2014, 10:02 AM   #7
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Whats the real deal with oxygen sensors?


My bank 2 downstream sensor got tore off in a snow storm three or four years ago. Throws up a code every now and again, I just clear it. Passes inspections too.

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Old 06-28-2014, 10:18 AM   #8
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Whats the real deal with oxygen sensors?


OP, you heard the wisdom:

DON'T FIX IT
IF IT AIN'T BROK
IF IT'S BROK
FIX IT RIGHT AWAY.

OF COURSE they want to you to believe that you MUST replace all kinds of components on REGULAR intervals. Right? Like with any "scientific research", always look who sponsored it.
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Old 06-28-2014, 11:34 AM   #9
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Whats the real deal with oxygen sensors?


Huh. Never heard the 'regular maintenance' excuse for replacement of oxygen sensors before (wink wink). I've had people come in and ask about it over the years, sometimes recommended by a different dealer, sometimes by an independent shop. Since I worked for a Ford dealer, I'd show them the recommended maintenance guide (oh wow! It's in their owners manual too!) where it never mentions the o2 sensors.

The new 6 wire sensors should theoretically last forever...we shall see. They don't use external air as an oxygen reference like the 4 wire sensors do so they're completely sealed.
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Old 06-28-2014, 01:35 PM   #10
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Whats the real deal with oxygen sensors?


They will get lazy over time, but as long as they are in spec any performance or economy effects will not be noticeable. I have seen cars come back though from just changing one side on high mileage cars due to the old sensor not switching as fast as the new one, which is why in school they recommend replacing all at the same time. Maybe if they were $25 a piece instead of $125
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Old 06-28-2014, 02:21 PM   #11
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Whats the real deal with oxygen sensors?


Replacing those sensors is right up there Transmission flushes at 50K miles.....
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Old 06-28-2014, 02:34 PM   #12
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Wow, I feel much better now (wiping sweat from forehead with back of right hand)!

yeah- so many out there spread so much myths- this one, I had to run by the guys here whom I know would be looking out for me!! Thnaks, people!! Now, time to change my tranny fluid as its been a whole 6 months (sarcasm/joke).......
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Old 06-28-2014, 05:38 PM   #13
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Whats the real deal with oxygen sensors?


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Wow, I feel much better now (wiping sweat from forehead with back of right hand)!

yeah- so many out there spread so much myths- this one, I had to run by the guys here whom I know would be looking out for me!! Thnaks, people!! Now, time to change my tranny fluid as its been a whole 6 months (sarcasm/joke).......
Don't forget to change your blinker fluid and rotate the air in your tires.
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Old 06-28-2014, 10:35 PM   #14
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Whats the real deal with oxygen sensors?


Quote:
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Replacing those sensors is right up there Transmission flushes at 50K miles.....
I wouldn't ever flush a transmission but I did change my toyota yaris trans fluid at 47k. It even had a drain plug. Replaced 2.6 quarts. New fluid was deep red. Old fluid a deep purple. Shifts better now.
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Old 06-28-2014, 11:47 PM   #15
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Whats the real deal with oxygen sensors?


Nothing wrong with changing trans fluid. It won't ruin a trans. If it fails afterwards there was something wrong with it. Like bad seals that sludge was sealing up.

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