On Tue, 23 Mar 2004 21:50:12 -0700, Tom <booyang1@hotmail.com> wrote:
>
> Not necessarily. The sensor is not grounded, it is simply
> malfunctioning. It isn't doing anything that would cause a 21 (sensor
> voltage shorted to ground, input voltage above normal range, neither rich
> nor lean condition detected, or heating element malfunction). The sensor
> seems to be constantly sending a lean condition signal (low voltage,
> around 120mV) to the PCM, so all the PCM sees is a constant lean
> condition and dumps fuel to richen the mixture.
>
>
Luck that you boys are talking about o2 sensors. The engine light came on
today in my truck. code p0131, o2 sensor shorting to ground. I got this
before maybe a month and a half ago. It eventually went away and i figured
the wet weather had something to do with it. Anyhow, it's back. I would
like to know how to trouble shoot this before I take it to the dealer so I
can at least tell them I found something wrong with it in case it goes back
to normal. I've never used a volt meter before. I also don't know where to
find it under the hood. I think the one on the exhaust is right after the
cat. So when I'm testing, do I unplug the wire from the sensor or is there
a way to do it while its plugged in? Also, what am I looking for?
-- -Droo
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