"Woody" <TheDuck@pond.net> wrote in
news:Wku3g.75554$dW3.59371@newssvr21.news.prodigy. com:

> I won,t believe it until I see it. Of coarse Subaru may have a defect
> in their OBDII code. Bad enough to cause fuel economy problems you
> could definitely see on the graph of the sensor.
>
>
> "Michael Pardee" <michaeltnull@cybertrails.com> wrote in message
> news:SZWdnVRoC4JHVNHZnZ2dnUVZ_s-dnZ2d@sedona.net...
>> "Woody" <TheDuck@pond.net> wrote in message
>> news:8s33g.69065$H71.136@newssvr13.news.prodigy.co m...
>>> Am 89 is not OBDII compliant and does not monitor the sensors that
>>> close and the sensors are totally different. The OBDII system
>>> monitors heater current and voltage and switching times and voltage
>>> to very precisely determine what they are doing. The chance of them
>>> causing a problem without setting a code is extremely slim. They can
>>> be setting sub codes long before turning on the light on the dash.
>>> The information in the computer should be thoroughly analyzed as
>>> swapping parts is expensive and could just be masking the real
>>> problem.
>>>
>>>
>> I would have thought OBDII would catch O2 weakness, too, but as the
>> Subaru experience illustrates it isn't necessarily so. I am puzzled
>> what sort of out-of-the-box defect the sensor would have that would
>> cause it to behave so badly and not be tattled on, though.
>>
>> Mike
>>
>
>
>

I did some Googling on "lazy oxygen sensor" and there were quite a number
of articles about the O2S affecting fuel economy.(without setting a code)
--
Jim Yanik
jyanik
at
kua.net