why do o2 sensors go bad

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Thread: why do o2 sensors go bad

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    Default why do o2 sensors go bad

    I just changed my 2 front O2 sensors a year ago. One went bad again. I replaced them with genuine parts. What or why make them go bad so fast? I have a trd supercharger factory install, I run 92 octane gas, I put on maybe 7,000 miles a year. Are aftermarket O2 sensors better? I am getting fed up I am thinking of just over riding the sensors so the light goes off. Is this bad?

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    Default Re: why do o2 sensors go bad

    Are you using non O2 sensor safe sealer anywhere? Maybe there is an issue with the fuel you are using? Try getting gas at a large corporate station that has lots of customers, as opposed to a smaller less popular one. Also if you run fuel additives, make sure these are OK with your sensors, or perhaps stop using the additives for a while.

    Another possibility....unnecessary repairs by your dealer. Maybe they are lying to you about the need to replace the sensors each time.

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    Default Re: why do o2 sensors go bad

    To many additives, to high of an octane fuel, bad/old fuel, jack rabbit driving, poor design...
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    Default Re: why do o2 sensors go bad

    Do you know what code your ECU is throwing?
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    Default Re: why do o2 sensors go bad

    Quote Originally Posted by OntheRox View Post
    jack rabbit driving
    Take away all the fun, why don't you.

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    Default Re: why do o2 sensors go bad

    Any coolant leaks? O2 sensors don't like engine coolant.

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    Default Re: why do o2 sensors go bad

    These are the ones I can think off...

    1) Bad coils/plugs resulting in improper burn resulting in downstream fuel making it to the sensors.
    2) Coolant leaks can foul sensors.
    3) Injectors not clean resulting in improper spray/burn.
    4) High heat due to back pressure from catalytic convertors.
    5) Bad sensors like OTC ones, they will fail soon.
    6) Remember sensors don't get bad all of a sudden, you will see the vehicle running lean thanks to lazy sensors. Good PM is 80K, just replace them even if they don't thro codes.

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    Default Re: why do o2 sensors go bad

    probably the gas, maybe your running too rich as well

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    Default Re: why do o2 sensors go bad

    Does it do any good to clean the sensors occasionaly?
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    Default Re: why do o2 sensors go bad

    ive replaced them and my check engine code is still on for all four of them (I think they run in series) and I can't go above 3k rpm. it really really sucks.

    it is still coding for my maf also which may or may not be related. any help?

    oh and most importantly, how do you override the sensors?

    i can't floor it. my passing power is gone, it's like driving a focus o.O

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    Cool Re: why do o2 sensors go bad

    they go bad from carbon and heat just like any o2 of af sensor.
    but you shouldnt need to worry about it they are covered under warranty if they have already been replaced and dont try to clean them,

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    Default Re: why do o2 sensors go bad

    The supercharger I would guess creates furnace like temperatures in your exhaust pipes that roasts your oxygen sensors. Just because the supercharger is a factory install doesn't mean it's harmless.

    In recent years Toyota even openly admits that some TRD parts and other performance hop ups like low profile tires or racing type brake rotors and pads will deliver deminished parts longevity compared to un-hopped up Toyota vehicles.

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    Default Re: why do o2 sensors go bad

    Quote Originally Posted by kathyricks View Post
    The supercharger I would guess creates furnace like temperatures in your exhaust pipes that roasts your oxygen sensors. Just because the supercharger is a factory install doesn't mean it's harmless.

    In recent years Toyota even openly admits that some TRD parts and other performance hop ups like low profile tires or racing type brake rotors and pads will deliver deminished parts longevity compared to un-hopped up Toyota vehicles.
    Yes, that is why I am having second thoughts about getting the supercharger. An engine is like a bar of soap....the harder you rub it, the sooner it wears out.

    (Hi Kathy )

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    Default Re: why do o2 sensors go bad

    Quote Originally Posted by Burger Steak & Eggs View Post
    Yes, that is why I am having second thoughts about getting the supercharger. An engine is like a bar of soap....the harder you rub it, the sooner it wears out.

    (Hi Kathy )
    The sc is a lot of fun though. It is well worth the extra 20 to 30 cents a gallon for fuel. And knock on wood, 39,000 trouble free miles so far. Don't laugh at me, I don't drive that much.
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    Default Re: why do o2 sensors go bad

    Quote Originally Posted by Peaches View Post
    ive replaced them and my check engine code is still on for all four of them (I think they run in series) and I can't go above 3k rpm. it really really sucks.

    it is still coding for my maf also which may or may not be related. any help?

    oh and most importantly, how do you override the sensors?

    i can't floor it. my passing power is gone, it's like driving a focus o.O
    The ECU doesn't use the O2/AFR sensors in open loop (coolant below 120 deg F, acceleration, and WOT). That's your bypass.

    The code for the MAF is most likely the reason for not being able to rev above 3000rpm. The engine needs to know how much air it's ingesting, otherwise the AFRs will just be completely out of spec (these are preset in the ECU). The MAF is used during open loop, so keep that in mind.
    Last edited by Jason.MZW20; 12-06-2008 at 07:22 AM.
    2005 Tacoma Double Cab V6 4x4 w/ TRD Off-Road pkg., Auto
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