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From: Jimmy on 9 Apr 2010 12:14
Jimmy <JimmyGeldb...(a)mailinator.com> wrote:
> My 4-cylinder 97Camryis showing a check engine light, and when
> Autozone scanned it, it was showing only a P0171 code (fuel-air
> mixture too lean).

To follow up, I went to a mechanic, who found two air fuel sensor
trouble codes in addition to P0171 (P1130, and another which I don't
have in front of me). He said the aftermarket sensor I installed a
year or two ago was no good, and recommended replacing it with a
Toyota sensor.

Jimmy
From: SMS on 9 Apr 2010 14:09
On 09/04/10 9:14 AM, Jimmy wrote:
> Jimmy<JimmyGeldb...(a)mailinator.com> wrote:
>> My 4-cylinder 97Camryis showing a check engine light, and when
>> Autozone scanned it, it was showing only a P0171 code (fuel-air
>> mixture too lean).
>
> To follow up, I went to a mechanic, who found two air fuel sensor
> trouble codes in addition to P0171 (P1130, and another which I don't
> have in front of me). He said the aftermarket sensor I installed a
> year or two ago was no good, and recommended replacing it with a
> Toyota sensor.

When I had similar problems with a Camry, my mechanic warned me against
the use of after-market sensors. He won't use them. The replacement
sensor is a Denso (Toyota) sensor specific to the vehicle. He said that
the after-market sensors go bad very quickly, if they work at all--it's
not just Toyota trying to sell you OEM parts. Remember to get the
specific sensor for your application, not a "one size fits all."

The sensors are of course ridiculously expensive. My mechanic has a big
box of the bad ones because someone buys them from him for the platinum.

Is it my imagination, or do Toyotas seem to have an abnormally high
level of these sensor failures? Two of our Toyotas have had them fail in
the past year, and my neighbor with a 2005 Highlander just had a failure
(fortunately he talked to me, because his clueless mechanic insisted
that he needed a whole new catalytic converter, which would still not
have fixed the problem of a bad air/fuel ratio sensor). I don't ever
recall one going bad on any other vehicle we've had or that extended
family members have had.
From: SMS on 11 Apr 2010 17:06
On 10/04/10 1:54 PM, Jimmy wrote:

> Thanks. But that link doesn't specify if it's for California
> emissions cars or not, and they don't list an air-fuel ratio sensor.

In California the front sensor is called an air/fuel ratio sensor, not
an 02 sensor, for whatever reason.

Do not use an after-market sensor. Use a Toyota or Denso sensor that is
specific to your vehicle. The after-market sensors will not work well or
last long, and they are not all that much cheaper anyway.
From: C. E. White on 16 Apr 2010 10:33

"SMS" <scharf.steven(a)geemail.com> wrote in message
news:4bbf6d49$0$1635$742ec2ed(a)news.sonic.net...
> On 09/04/10 9:14 AM, Jimmy wrote:
>> Jimmy<JimmyGeldb...(a)mailinator.com> wrote:
>>> My 4-cylinder 97Camryis showing a check engine light, and when
>>> Autozone scanned it, it was showing only a P0171 code (fuel-air
>>> mixture too lean).
>>
>> To follow up, I went to a mechanic, who found two air fuel sensor
>> trouble codes in addition to P0171 (P1130, and another which I
>> don't
>> have in front of me). He said the aftermarket sensor I installed a
>> year or two ago was no good, and recommended replacing it with a
>> Toyota sensor.
>
> When I had similar problems with a Camry, my mechanic warned me
> against the use of after-market sensors. He won't use them. The
> replacement sensor is a Denso (Toyota) sensor specific to the
> vehicle. He said that the after-market sensors go bad very quickly,
> if they work at all--it's not just Toyota trying to sell you OEM
> parts. Remember to get the specific sensor for your application, not
> a "one size fits all."
>
> The sensors are of course ridiculously expensive. My mechanic has a
> big box of the bad ones because someone buys them from him for the
> platinum.
>
> Is it my imagination, or do Toyotas seem to have an abnormally high
> level of these sensor failures? Two of our Toyotas have had them
> fail in the past year, and my neighbor with a 2005 Highlander just
> had a failure (fortunately he talked to me, because his clueless
> mechanic insisted that he needed a whole new catalytic converter,
> which would still not have fixed the problem of a bad air/fuel ratio
> sensor). I don't ever recall one going bad on any other vehicle
> we've had or that extended family members have had.

I think Toyota tries to very tightly control the AF Ratio to maximize
fuel economy while still meeting emmision requirements. I believe that
this makes the performance of some of their components exceptionally
critical to proper performance.

Ed


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