O2 Bank1 Sensor '01 Toyota Avalon (false positive?)

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NewsGroups - 20 Jan 2007 21:25 GMT

I just had my '01 Toyota Avalon in the shop to replace the timing belts &
engine belt, Monday.
Today being Saturday afternoon I started the car to go out and the check
engine light came on. I dropped by the service dept and had it checked. The
service dept. said I need an O2 sensor Bank1 Sensor 1 '01 Toyota Avalon -
P01135 - I .

Thursday, I filled half way with gas and added a large bottle of Techron. Do
you think that may have caused a false positive - such a strong ratio of
Techron to half tank of gas? Should I have the code cleared and see what
happens?

Thanks for all the help.

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aarcuda69062 - 20 Jan 2007 22:05 GMT

> I just had my '01 Toyota Avalon in the shop to replace the timing belts &
> engine belt, Monday.
[quoted text clipped - 9 lines]
>
> Thanks for all the help.

There is no such code as a P01135. Was it perhaps a P1135 or a
P0135 or a P0113?

Assuming that the O in your P01135 is a typo, and that the real
code is P1135, that is an air fuel sensor heater code and is not
likely to be caused by your over dousing the fuel with Techron.

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Don - 21 Jan 2007 01:27 GMT

>> I just had my '01 Toyota Avalon in the shop to replace the timing belts &
>> engine belt, Monday.
[quoted text clipped - 16 lines]
>code is P1135, that is an air fuel sensor heater code and is not
>likely to be caused by your over dousing the fuel with Techron.

I have yet to see an O2 heater code be a false positive for a failed
O2. "Lean indication," "out of range," etc. are frequently NOT going
to be fixed with a new sensor but need the dirty MAF cleaned or a
vaccum leak fixed.

We probably replace 1-2 O2 sensors/week for burnt out heaters. At
this time when we see a heater code we just replace the O2 sensor --
hasn't bitten us yet.

Don
www.donsautomotive.com

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Scott Dorsey - 20 Jan 2007 22:08 GMT

>I just had my '01 Toyota Avalon in the shop to replace the timing belts &
>engine belt, Monday.
>Today being Saturday afternoon I started the car to go out and the check
>engine light came on. I dropped by the service dept and had it checked. The
>service dept. said I need an O2 sensor Bank1 Sensor 1 '01 Toyota Avalon -
>P01135 - I .

No, they shouldn't have said that. That code means the oxygen sensor is
out of range. Now that COULD be caused by a bad sensor, but more likely
an engine that is misfiring.

>Thursday, I filled half way with gas and added a large bottle of Techron. Do
>you think that may have caused a false positive - such a strong ratio of
>Techron to half tank of gas? Should I have the code cleared and see what
>happens?

Probably not, but it could be. More likely there is some other issue causing
your exhaust to be way off. I'd reset it first and see what happens but I
would also pull data off all the other engine sensors and see what is going
on inside.
--scott

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Comboverfish - 21 Jan 2007 01:24 GMT

> >I just had my '01 Toyota Avalon in the shop to replace the timing belts &
> >engine belt, Monday.
[quoted text clipped - 6 lines]
> out of range. Now that COULD be caused by a bad sensor, but more likely
> an engine that is misfiring.

Nope, P1135 (improperly typed code # corrected) is set when the B1S1
A/F sensor *heater* fails it's monitor test. RE: "P01135 - I" -- I'm
willing to bet that the poster wrote down exactly what was written on
the invoice. It wouldn't be the first time that a service writer
passed on incorect info to the customer.

> >Thursday, I filled half way with gas and added a large bottle of Techron. Do
> >you think that may have caused a false positive - such a strong ratio of
[quoted text clipped - 5 lines]
> would also pull data off all the other engine sensors and see what is going
> on inside.

Definitely not. I wouldn't worry about it (other than the sensor cost)
because heater failure on the B1S1 of more recent Toyota transverse V6s
is a really common problem, which is supposedly fixed with the latest
OE part(s) revisions.

Toyota MDT in MO

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