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T

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Discussion Starter #1
Hi all,

Sometime over the summer, the "check engine" light in my 1998 Camry
started coming on every once in a while. Sometimes it would stay on for
a few days, other times just a few minutes.

My mechanic had a look at it in September and said I needed a new O2
sensor (error code was: P1133 Bank 1, Sensor 1). I asked him if the
intake was too high or too low, but he said his technician had reset
the code before he had a chance to look at it and he couldn't remember
what it said.

My mechanic was pressing me to replace the sensor ASAP, but a friend of
mine suggested I should wait and see if the light comes on again. The
"check engine" light has not come on since it was reset two months ago.

I don't want to spend $250 + labour on an O2 sensor I don't need. How
important is it for me to change it?
 
M

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Discussion Starter #2
My mechanic tested the o2 sensor on something like an engine anaylzer
with tailpipe sensor, any mechanic that does not test something is a
hack.
 
J

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Discussion Starter #3
"Theo" <[email protected]> wrote in message
news:[email protected]
> Hi all,
>
> Sometime over the summer, the "check engine" light in my 1998 Camry
> started coming on every once in a while. Sometimes it would stay on for
> a few days, other times just a few minutes.
>
> My mechanic had a look at it in September and said I needed a new O2
> sensor (error code was: P1133 Bank 1, Sensor 1). I asked him if the
> intake was too high or too low, but he said his technician had reset
> the code before he had a chance to look at it and he couldn't remember
> what it said.
>
> My mechanic was pressing me to replace the sensor ASAP, but a friend of
> mine suggested I should wait and see if the light comes on again. The
> "check engine" light has not come on since it was reset two months ago.
>
> I don't want to spend $250 + labour on an O2 sensor I don't need. How
> important is it for me to change it?


The engine management computer constantly tests the O2 sensor by adjusting
the engines mixture slightly off stoichemetric (14.7:1 air:fuel ratio) in
both directions (rich and then lean), while simultaneously looking for the
correct correlating signal from the O2 sensor. If the signal from the sensor
remains unchanged, then the computer will light the check-engine lamp.

Its possible, the sensor was temporarily unserviceable due to an
intermittant wiring fault, or some exhaust deposit on the sensor.

To be sure, I'd ak the mechanic if he has done something to the car to stop
the alarm,..other wise all could now be well.

If your economu is normal, that's another indicator the O2 sensor is
working.

Jason
 
D

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Discussion Starter #4
If it isn't working properly you should change it, but I would try some
Red Line complete fuel system cleaner first.
Can be used continuously and is reported to clean emission control
components.
O2 sensor in my '94 still tests good - although it is a slightly
different design than yours, I believe those sensors tend to fail from
carbon accumulation so would try the cleaner - but only the Red Line
was rigorously tested and approved by BMW. Others have solvents, or
raise combustion temperatures.
Just my opinon, but have been very pleased.
If you're intersted, their web site has an extensive technical data
section.
 
J
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Discussion Starter #5
True, the only way to test an oxygen sensor is with smog equipment or
in a lab while looking at the waveforms, but nevertheless a difficult
thing to do. So if it's not giving you MIL codes and your mileage is
not dropping then you may want to wait on it.

There are many posts lately on failing Camry oxygen sensors. So I'll
say stay away from Denso ones. If you need to replace it, get a Bosch
unit. I think Densos are el-cheapo units that fail early, their website
still thinks today's engines are dumping lead and coolant onto the
sensors.

US made Toyotas are more likely to get a Bosch unit than Densor or NTK.


http://www.boschusa.com/AutoParts/OxygenSensors/
 

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The mileage of my Camry 1998 has dropped from 10L/100Km to 14L/100Km over the last 6 months. Should I suspect the oxygen sensors? Thanks.
 
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