> Can someone help me? What is the O2 sensor? What does it do?
> Can it be
> replaced as a DIY job?
02 sensor is normally located somewhere near your exhaust either in
the exhaust itself or on the exhaust manifold. It measures the amount
of C02 and carbon monoxide and that sort of thing that your engine is
putting out through your exhaust system. Using this information the
engine mangement computer can tell if the engine is running rich or
lean and alter the of fuel/air mixture that is put into your engine
accordingly to ensure that your engine is always running at peak
I do know that they are very sensitive and can stop your engine
completely. One person I knew fitted a new exhaust system to his car
himself and the gasket cement that he used confused the O2 sensor and
stopped the engine altogether.
The ones I have seen look like they could be easily replaced by a DIY.
Not that I have ever done one. You would be better asking a few more
questions first I think.
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Can't tell you about an Isuzu, but it was pretty easy on my Dodge Caravan,
and I'm far from being a mechanic. If you've got a Trooper, I know some of
those are programmed to kick on every 90k. Supposedly a screw you can move
a screw in the dash to turn it off. But, maybe you're talking about a
different model Isuzu...?
Oxygen sensor... it is screwed into fittings into exhaust pipe.
Newer vehicles can have three or more, located before (in down pipe,
manifolds or y-pipe) and after the catalytic convertor(s).
The engine control computer reads oxygen content in the exhaust gasses
and uses that (along with other readings) to compute optimum fuel
mixture for max. economy, min. emissions. If the sensors are bad it
gives incorrect reading and your engine will run very poorly. If you
let it go for a long time the seriously bad mixtures will ruin your
catalytic convertor(s) too and that gets really expensive; replacing
convertors is usually not a job for a DIY'er as it frequently entails
I haven't had to replace any O2 sensors, but it doesn't look to be too
difficult. Spray thread penetrant on the threads and let it soak
overnight... use a deep-well socket and appropriate breaker bar.
If it is really obstinant and won't loosen, use a propane torch to
heat the fitting.
Most auto parts stores sell special sockets that clear the wire lead
and connector for putting in a new one.
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