Check Engine light

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Old 27 Jun 2006, 06:05 pm   #1 (permalink)
learnfpga@gmail.com
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Default Check Engine light

I have a check engine light with code 1133 and 1135 meaning its the air
fuel ratio sensor problem. I checked online and found that 1999 camry
had this problem and in some cases there is a need to change the
computer of the car which is covered under warranty till 80,000 miles
or 96 months.

The problem is dealer says my harnesses are bad and I should have all
the harnesses replaced (cost $1395) and if that doesnt fix the problem
then they will change the ECM module which is covered under warranty.

My mechanic says that there is no problem with the harnesses because he
ohmed out all the connections and they all look fine.

Any suggestions.......?

Another thing that I am thinking is to buy OBD-II reader from autozone
for 100 bucks and erase the code while inspection and then drive the
car with check engine light because after all it should honestly be
check emissions light......

Do you guys think that will work...........?

Sorry for the long post....any help would be greatly appreciated......

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Old 27 Jun 2006, 08:00 pm   #2 (permalink)
qslim
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Default Re: Check Engine light

Wow. You'd think that out of the three components in that system (the
computer, the harness, and the sensor) the one that sits in a 1300?F
exhaust stream all day would be the most likely culprit. Has the system
actually been diagnosed?

For the record, I've replaced one computer for this problem, no
harnesses, and about 1000 AF sensors.

Buying a cheap code reader will do nothing for you here. You already know
what the code is. You need someone with a scan tool that can access the
entire data list and actively test systems (those are over $2000) AND that
someone needs to know how to interpret what they are looking at.
If I were you I would ask to have a sit down with the service manager of
the dealer that recommended replacing the harness and ask for a detailed
explanation as to why the technician is diagnosing this extremely rare
case in your Toyota. I'm not saying the harness isn't at fault, it only
that factory wiring problems are VERY few and far between. VERY.

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Old 27 Jun 2006, 11:50 pm   #3 (permalink)
johngdole@hotmail.com
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Default Re: Check Engine light

True, not that ECM and harness can't go wrong. But it may be the Denso
oxygen sensors acting up. I'd buy Bosch sensors, best in class.

http://www.boschautoparts.com/Products/OxygenSensors


qslim wrote:
> Wow. You'd think that out of the three components in that system (the
> computer, the harness, and the sensor) the one that sits in a 1300?F
> exhaust stream all day would be the most likely culprit. Has the system
> actually been diagnosed?
>
> For the record, I've replaced one computer for this problem, no
> harnesses, and about 1000 AF sensors.
>
> Buying a cheap code reader will do nothing for you here. You already know
> what the code is. You need someone with a scan tool that can access the
> entire data list and actively test systems (those are over $2000) AND that
> someone needs to know how to interpret what they are looking at.
> If I were you I would ask to have a sit down with the service manager of
> the dealer that recommended replacing the harness and ask for a detailed
> explanation as to why the technician is diagnosing this extremely rare
> case in your Toyota. I'm not saying the harness isn't at fault, it only
> that factory wiring problems are VERY few and far between. VERY.


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Old 28 Jun 2006, 06:29 am   #4 (permalink)
m Ransley
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Default Re: Check Engine light

It sounds like the dealer is a crook, harnesess last the life of the
car. Contact toyota to complain and go to another dealer, Could
something like your o2 sensor be bad.

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Old 28 Jun 2006, 08:03 am   #5 (permalink)
learnfpga@gmail.com
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Default Re: Check Engine light

Thanks for all your responses....

I already went to the dealer and he has diagnosed the whole problem
using the scan tool (same goes for my mechanic). The dealer also gave
me in writing that they suspect harness is an issue and if that does
not solve the problem of CEL "only the" will they replace the
computer.....

Also....... I had my sensor changed and I bought the expensive
one............not the cheap one.....

I guess my Q to you guys is can I pass inspection test if I erase the
codes just before inspection using a cheap scan tool......?

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Old 28 Jun 2006, 07:49 pm   #6 (permalink)
tejab
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Default Re: Check Engine light

Today i used OBD-2 and erased the code and my car passed NJ emissions test.
U can try too.

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Old 29 Jun 2006, 12:43 am   #7 (permalink)
johngdole@hotmail.com
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Default Re: Check Engine light

Pull the ECM fuse for a couple of minutes (in the engine compartment,
driver side fuse box). This will clear the codes. However, if your
oxygen sensor is bad, you probably won't pass (this is a good,
inexpensive test, as many centers retest for free!!!).

If it's the oxygen sensor, you should be fine now that you replaced it.
For one I don't care much for Denso sensors. They make excellent
alternators but their oxygen sensors are crap. I use Bosch sensors,
best in class:

http://www.boschautoparts.com/Products/OxygenSensors

BTW, P1133 is insufficient sensor switching; P1135 is oxygen sensor
heater circuit problem. How did that dealer arrive at ECM problem and
harness. Wanting to charge you for the harness and then the ECM. You'll
pay more than your car's worth after all the work.




learnfpga@gmail.com wrote:
> Thanks for all your responses....
>
> I already went to the dealer and he has diagnosed the whole problem
> using the scan tool (same goes for my mechanic). The dealer also gave
> me in writing that they suspect harness is an issue and if that does
> not solve the problem of CEL "only the" will they replace the
> computer.....
>
> Also....... I had my sensor changed and I bought the expensive
> one............not the cheap one.....
>
> I guess my Q to you guys is can I pass inspection test if I erase the
> codes just before inspection using a cheap scan tool......?


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Old 29 Jun 2006, 12:51 am   #8 (permalink)
johngdole@hotmail.com
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Default Re: Check Engine light

Also, regarding the Autozone OBD-II reader. Can't you borrow it for
free to check the codes and clear the MIL light? Many of us do.


learnfpga@gmail.com wrote:
> Another thing that I am thinking is to buy OBD-II reader from autozone
> for 100 bucks and erase the code while inspection and then drive the
> car with check engine light because after all it should honestly be
> check emissions light......


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Old 29 Jun 2006, 10:27 pm   #9 (permalink)
qslim
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Default Re: Check Engine light

That won't work, and here's why:

In your engine computer are a list of "monitors". These monitors are
programs that run during specific periods of operation to determine if
your cars systems are working correctly. There is an EGR monitor, O2
monitor, catalytic monitor, misfire monitor, etc... These monitors are
read as pass/fail/incomplete by the OBDII emissions software. In order to
pass, you have to have a certain # of complete monitors, with no failures.
So, if you have the required # of passing monitors and 1 failed monitor
(your check engine light), you will not pass emissions. When you go to
clear the check engine light, all of your monitors will reset. Now you
will not have the required # of completed monitors, and again you will not
pass the emissions test.

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Old 03 Jul 2006, 07:04 am   #10 (permalink)
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Default Re: Check Engine light


> The problem is dealer says my harnesses are bad and I should have all
> the harnesses replaced (cost $1395) and if that doesnt fix the problem
> then they will change the ECM module which is covered under warranty.


They want in your pocket before they get into Toyota's, huh?

Anything is possible, I guess, but I tend to doubt the veracity of most
dealers, and especially those that come up with this sort of crap.


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