Check Engine light goes on and off for the last 3 years

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Old 24 Nov 2005, 09:48 am   #1 (permalink)
DaveG
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Default Check Engine light goes on and off for the last 3 years

I have a 1999 Toyota Solara and for the last 3 years the (Check Engine
light) goes on and off.

Cars seems to be running OK. Went to Auto Zone when I catch it on and they
said it's a P1133.

Lately the lights on longer, half the time. The car still runs fine. Auto
Zone says 4 codes show up only two different ones P1133 and P1153

P1133 Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1
(Rear Bank)

P1153 Heated Oxygen Sensor (HO2S) insufficient switching bank 2 sensor 1
(Front Bank)

Before I go to the dealer and pay the big bucks I'd like
your opinion.

Thanks in advance



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Old 24 Nov 2005, 10:21 am   #2 (permalink)
Stephen H
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Default Re: Check Engine light goes on and off for the last 3 years

I'd start with a bank 1 o2 sensor and not take it to the dealer.


--
Stephen W. Hansen
ASE Certified Master Automobile Technician
ASE Undercar Specialist

http://autorepair.about.com/cs/troub...l_obd_main.htm
http://www.troublecodes.net/technical/


"DaveG" <dgiumen1@rochester.rr.com> wrote in message
news:Tglhf.26982$JQ.17473@twister.nyroc.rr.com...
>I have a 1999 Toyota Solara and for the last 3 years the (Check Engine
>light) goes on and off.
>
> Cars seems to be running OK. Went to Auto Zone when I catch it on and they
> said it's a P1133.
>
> Lately the lights on longer, half the time. The car still runs fine. Auto
> Zone says 4 codes show up only two different ones P1133 and P1153
>
> P1133 Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1
> (Rear Bank)
>
> P1153 Heated Oxygen Sensor (HO2S) insufficient switching bank 2 sensor 1
> (Front Bank)
>
> Before I go to the dealer and pay the big bucks I'd like
> your opinion.
>
> Thanks in advance
>
>
>



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Old 25 Nov 2005, 01:51 am   #3 (permalink)
Jason James
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Default Re: Check Engine light goes on and off for the last 3 years


"DaveG" <dgiumen1@rochester.rr.com> wrote in message
news:Tglhf.26982$JQ.17473@twister.nyroc.rr.com...
> I have a 1999 Toyota Solara and for the last 3 years the (Check Engine
> light) goes on and off.
>
> Cars seems to be running OK. Went to Auto Zone when I catch it on and they
> said it's a P1133.
>
> Lately the lights on longer, half the time. The car still runs fine. Auto
> Zone says 4 codes show up only two different ones P1133 and P1153
>
> P1133 Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1
> (Rear Bank)
>
> P1153 Heated Oxygen Sensor (HO2S) insufficient switching bank 2 sensor 1
> (Front Bank)
>
> Before I go to the dealer and pay the big bucks I'd like
> your opinion.
>
> Thanks in advance


By "insufficient switching" they're saying the sensor is not following the
fine mixture changes the engine management computer deliberately causes to
test the sensors (I guess a V6 has one for each bank of 3 cylinders).
Whether both sensors are actually faulty doesnt sound right to little 'ol
me?!

Jason


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Old 25 Nov 2005, 10:19 am   #4 (permalink)
Daniel
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Default Re: Check Engine light goes on and off for the last 3 years

I always like to have the factory service manuals.
For my year (5 yrs. older than yours) there's a test for the oxygen
sensors.
On mine, there's an under hood "data link connector" with a flip up
cover and labeled pins, including oxygen sensor.
The test involves using a volt meter to read the number of voltage
fluctuations over a short period of time and if the count exceeds a
certain number the sensor is good.
Your oxygen sensors are heated. Mine aren't.
The heating circuit, is like a filament in an incandescent light bulb.
They can burn out. My understanding is that this is one of the more
common failure modes. The heating element helps the sensor reach
operating temperature more quickly.
Apart from the heating element, my understanding is that oxygen sensors
degrade slowly over time primarily from carbon accumulation.
My theory, is that if the car is kept in good condition, (don't know if
your model has spark plug wires or "coil over" set up or even a
distributor) on mine, I've replaced the distributor cap, rotor, and
spark plugs, removed and completely adjusted and cleaned the throttle
body including the vacuum ports to the EGR modulator.
I also use Red Line complete fuel system cleaner in every tankful which
promotes cleanliness including emission control components.
When I replaced the oil pan gasket and removed the section of exhaust
pipe for access, I could see the second O2 sensor and it was completely
free of any carbon.
Also the main oxygen sensor still tests significantly more voltage
fluctuations than required in the manual, so although I was considering
replacing it just based on mileage alone (apx. 140,000), I have not. I
once replaced an oxygen sensor on a Mercedes, just to "help it run
better" as a "maintenance item" and could detect zero difference.
The newer O2 sensors are more sensitive and efficient. As you may know
the oxygen sensor monitors the exhaust stream to feed data to the ECM
(electronic control module aka: engine computer) to continuously adjust
the fuel mixture at the injectors.
One of the reasons I like the Red Line product, is that their technical
data section explains that if one injector is slightly off, the O2
sensor at the exhaust manifold is altered richening the mixture at all
injectors to compensate and raise the average reading at the exhaust
manifold, lowering efficiency and fuel economy.

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Old 25 Nov 2005, 11:34 am   #5 (permalink)
Jason James
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Default Re: Check Engine light goes on and off for the last 3 years


"DaveG" <dgiumen1@rochester.rr.com> wrote in message
news:Tglhf.26982$JQ.17473@twister.nyroc.rr.com...
> I have a 1999 Toyota Solara and for the last 3 years the (Check Engine
> light) goes on and off.
>
> Cars seems to be running OK. Went to Auto Zone when I catch it on and they
> said it's a P1133.
>
> Lately the lights on longer, half the time. The car still runs fine. Auto
> Zone says 4 codes show up only two different ones P1133 and P1153
>
> P1133 Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1
> (Rear Bank)
>
> P1153 Heated Oxygen Sensor (HO2S) insufficient switching bank 2 sensor 1
> (Front Bank)
>
> Before I go to the dealer and pay the big bucks I'd like
> your opinion.
>
> Thanks in advance


Here's a site with much detail on O2 sensors, including types, how they
operate and testing.

http://home.flash.net/~lorint/lorin/fuel/oxybench.htm

Jason


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