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From: msrdude on 22 Nov 2009 23:38
I was wondering, I have a 96 corolla with about 125 k miles and I
never replaced my o2 sensors before and the check engine light is not
on. I was wondering, can the o2 sensor cause my car to get poor gas
mileage and the check engine light will not be on?
From: Jeff Strickland on 22 Nov 2009 23:42

"msrdude" <kimiga(a)gmail.com> wrote in message
news:b65d8292-7877-4665-91f2-01a60ec37cb5(a)m7g2000prd.googlegroups.com...
>I was wondering, I have a 96 corolla with about 125 k miles and I
> never replaced my o2 sensors before and the check engine light is not
> on. I was wondering, can the o2 sensor cause my car to get poor gas
> mileage and the check engine light will not be on?


Not bad enough that you'd notice.

If you religiously kept a mileage log and carried it out 3 or 4 digits past
the decimal point, then you might see the O2 Sensor as it failed, but so
many other things affect the mileage that it would be poor troubleshooting
technique to replace the sensor because the 4th digit floated around.

Do not worry about the sensor until the car tells you to worry.







From: Ray O on 23 Nov 2009 00:19

"msrdude" <kimiga(a)gmail.com> wrote in message
news:b65d8292-7877-4665-91f2-01a60ec37cb5(a)m7g2000prd.googlegroups.com...
>I was wondering, I have a 96 corolla with about 125 k miles and I
> never replaced my o2 sensors before and the check engine light is not
> on. I was wondering, can the o2 sensor cause my car to get poor gas
> mileage and the check engine light will not be on?

No. The O2 sensors have to be pretty far out of specifications to make a
noticeable difference in fuel consumption, and the check engine light will
illuminate before the sensors get that far out of spec.
--

Ray O
(correct punctuation to reply)


From: msrdude on 23 Nov 2009 14:27
Well I am kind of getting bad fuel economy on my car. I replaced the
air filter, spark plug, spark plug wires, poured in fuel injector and
fuel system cleaner into my gas tank after fill up. It sill made no
difference. So I suspect the o2 sensor is kind of bad causing the fuel
economy to be kind of bad. Well I never replaced the o2 sensor before
and its 125 k miles on it. Well I should replace it anyways because it
is almost due anyways.
Should I buy the NTK o2 sensors or should I go with OEM Toyota?
From: Mike Hunter on 23 Nov 2009 14:53
What you SHOULD do is take the car to a competent tech, who has the proper
equipment to analyze WHY the check engine light is illuminated and have the
fault corrected, or you can continue to change some very expensive parts,
like the O2 Sensor, until you hit upon the correct part that is causing the
check engine light to illuminate.

The O2 Sensor rarely fails, but it does become contaminated, because of what
could be a minor fault in the closed loop system


"msrdude" <kimiga(a)gmail.com> wrote in message
news:1a09a78d-5841-4338-be7c-5c15429c0275(a)k13g2000prh.googlegroups.com...
> Well I am kind of getting bad fuel economy on my car. I replaced the
> air filter, spark plug, spark plug wires, poured in fuel injector and
> fuel system cleaner into my gas tank after fill up. It sill made no
> difference. So I suspect the o2 sensor is kind of bad causing the fuel
> economy to be kind of bad. Well I never replaced the o2 sensor before
> and its 125 k miles on it. Well I should replace it anyways because it
> is almost due anyways.
> Should I buy the NTK o2 sensors or should I go with OEM Toyota?
>


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