Are you sure you are not just shooting the messenger instead
of attacking the problem?? The sensor is supposed to give
error messages when things are out of kilter. What is the
exact code that was stored? If the sensor is accusing
something in the system of being out of range, the first
thing you do is consider what may cause that and address
that problem. O2 sensors these days are expensive enough to
almost cove a diagnostic fee to be sure you are
repairing/replacing the correct parts.
There are many things that can result in an out of range O2
sensor reading. A qualified techwith a good scanner can
check other calues in the system that may indicate a problem
other than the sensor. As I said, the sensor is just the
messenger in most cases. Many less than qualified techs get
a bad reading on a sensor and immediately replace the sensor
just to find out the sensor was telling the truth. That is
why the exact code and an understanding of what may cause
that code to be set is important. You may need to ask the a
few questions to learn why they condemned the sensor. The
sensor may be the problem - I just want to point out that
several other things can result in a bad sensor reading.
Hear Hear!!!. Nothing like "experienced parts" when troubleshooting.
replacing parts that cannot be proven defective is a good way to end
up chasing your tail. Even replacing those you CAN prove defective is
sometimes troublesome. I have a 1994 Trans Sport 3.8 which I bought
with a toasted engine 4 years ago. I put a new rebuilt engine in, with
a new Bosch O2 Sensor. On the first long trip (to Florida from
Ontario) the engine misfired occaisionally and eventually turned on
the check engine light and threw a code (can't remember the number)
indicating it was running lean. I figured it was a bad O2 sensor, but
was unable to prove it 100%, so I put in a new one (under warranty).
That summer I attempted to tow my 17 foot trailer, and could not go
30km without having it act up. I checked EVERYTHING - neglecting te
now twice replaced O2 sensor. I finally gave up and sold the trailer
after not using it for 2 summers. Then last winter it started doing
the stutter/cut out thing again - and putting the CEL on while driving
to work. I put the OBD tester on, with it monitoring O2 sensor
voltages and when it started acting up, I found the voltage stuck at
0.44 volts. That is neither rich, nor lean - and the code (when it
finally showed)said engine lean.The sensor was going open circuit, and
we were reading the ECU supplied bias. I put in a new AC Delco O2
sensor and have not had the problem in the last 11 months.
This is not an isolated incident. There are an AWFULL lot of
defective, dead in the box, parts being sold today - and if you
install one while troubleshooting it WILL ruin your day!!!.
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