My wife's '99 (4-cyl, auto) camry has the dreaded Check Engine Light.
OBD-II codes are P0125/P1135. A web search said try changing the
front oxygen sensor.

Haynes said the resistance of the oxygen sensor heater wire should be
a few ohms. My sensor says it's an open circuit (wire burned out?)

So I'm pretty sure I really do need a new oxygen sensor.

Now... is it an Oxygen Sensor or an Air Fuel Ratio Sensor?

Dealer wants $222 for it (Air Fuel Ratio Sensor).
AutoZone wants about $115 for it (front Oxygen Sensor, Bosch)

I'm in California, and I'll need the California one, of course.

Now I hear that there's a Generic Bosch one, I just have to cut the
wires and re-splice. (about $76 at Kragen)

What color goes to which wire? Can anyone post a wiring diagram for
me?

Thanks,

Michael

On May 19, 1:22 pm, mrdarr...@gmail.com wrote:


Whoops, looks like Kragen part 15733 ($75.99) is meant to be the
DOWNstream oxygen sensor, not the front UPstream one.

Although, it's got 4 wires...

Anyone have any recommendation for Air Fuel Ratio Sensor (Toyota
Dealer) vs. Wideband Oxygen Sensor (Bosch)? I'm looking at Autozone
part 13733.

Thanks,

Michael

You can get a plug and play upstream cali bosch sensor for $185 from
rockauto.com. If you're willing to splice wires, you can do slightly
better.

They all have 4 wires; 2 for the heater and two for the sensor itself.

They are different types of oxygen sensors: Unheated Thimble, Heated
Thimble, Planar, Wideband, and Titania. Tyota refers "wideband" as the
A/F ratio sensor, like they referred to engine sludge as oil gel. Same
thing.

Oxygen sensor FAQ:
http://www.boschautoparts.com/Resour...genSensors.htm

Yeah, use the rockauto.com price as a reference. The Bosch 13733 is
the only choice for Calif. However, this sensor looks like a reboxed
Denso (Bosch, like AC Delco, also distributes parts it doens't make so
you can use it as a one-stop shop). You can get the Denso cheaper
(#2349024 ?? $147.99). In this case there is no choice but to go with
the cheap Denso part.

Dealer parts have substantial mark-up. For example, the same
Mitsuboshi timing belt costs about $14 on rockauto.com will cost about
$40 at the dealer. But somebody has to pay for the flat screen TV and
free coffee.

The Bosch universal sensor comes with an instruction. The 15733
downstream is an excellent *planar* type that better resists
contamination. There are actually over a dozen types of "universal"
sensors with different response signal curves. So select only from the
catalog.



On May 19, 1:22 pm, mrdarr...@gmail.com wrote:

If you have to change the front and the car has over 100K miles
consider getting the Bosch planar universal sensor for the downstream.
You can splice it. Follow the instruction carefully and you shouldn't
have problems. make sure the Posi-Lok connectors are hand tight.

Also, Autozone has free loaner sensor sockets.




On May 19, 1:22 pm, mrdarr...@gmail.com wrote:

On May 19, 3:34 pm, Nobody Important <Dr.Xen...@gmail.com> wrote:

They sure don't make their items easy to read...

BOSCH Part # 15733 More Info {Oxygen Sensor}
Except California Emissions; 4 Wire; Heated; Check / Replace Interval:
100,000 Miles; Universal Type - Upstream
w/ California Emissions; 4 Wire; Heated; Check / Replace Interval:
100,000 Miles; Universal Type - Downstream
Except California Emissions; 4 Wire; Heated; Check / Replace Interval:
100,000 Miles; Universal Type - Downstream

$57.79... is it for California or not? Both upstream AND downstream,
with wire splicing?

Oh well, I'll try the autozone part for now... can return it if it
doesn't work, they said...

Michael

There are Calif and Non-Calif; Upstream and Downstream; OEM connector
or Universal splice. These mean up to 8 combinations!!

Look on Bosch's catalog:
http://www.boschautoparts.com/RB.NA....& Make=TOYOTA

Calif Downstream:
13353 with OEM connector (no splicing)
15733 universal (need to splice old connector on here, but cheaper)

Calif Upstream (only OEM type available):
13733 with OEM connector (no splicing)




On May 19, 6:53 pm, mrdarr...@gmail.com wrote:

On May 19, 10:09*pm, johngd...@hotmail.com wrote:
Hi I live in Maine but have California 99 4 cylinder Camry. I Replaced
the O sensor in the engine compartment two summers ago. The light went
out for a while. The light came on in the fall.AutoZone checked and
told me the one near the cat converter was gone. At those prices I
waited. About the middle of April the light went out and has been out.
I checked and the gas companys switch to a winter blend in the late
fall early winter. They switch back in the spring. Seems sensor is
fine.
my 2cents.

On May 19, 6:28 pm, johngd...@hotmail.com wrote:

Whoa, you mean AutoZone will LEND you oxygen sensors?

News to me!

Thanks...

FWIW, so far the car is doing just fine, after driving about 15 miles
to go shopping and back. I guess I could have got the cheaper $50 or
so part from RockAuto, but the wife is happy that the check engine
light is gone now.

Maybe I should replace the oxygen sensor on my '96 camry too... 152k
miles. No CEL, but maybe mpg will increase...?

Thanks all,

Michael

On May 19, 8:42 pm, norm46 <nrow...@roadrunner.com> wrote:

Rear sensor is probably fine, but your catalyst might be a different
story...? [sensor indicating catalyst is not performing properly?]

Just time your smog checks to be in the spring... (do you have smog
checks in Maine?)

Thanks for sharing,

Michael

On May 19, 7:09 pm, johngd...@hotmail.com wrote:

Ah, ok.

From Bosch's website it looks like the 15733 will NOT work upstream
for California.

(but why would RockAuto list it as both Up and Downstream?)

Looks like Autozone was a good deal for the 13733, at ~$115; RockAuto
wants ~$185.

Michael

Because the excellent Bosch 15733 planar type sensor can be used
UPSTREAM and DOWNSTREAM in states other than Calif (maybe also NY and
MA).

Notice the "Calif" and "Exc. Calif" notations on rockauto.com, kinda
hard to read I know. That's why I like to verify using Bosch's web
site. .



On May 19, 11:05 pm, mrdarr...@gmail.com wrote:

On May 20, 9:14 pm, johngd...@hotmail.com wrote:

Got it now, thanks.

Car works perfectly now, no Check Engine Light. I just put the anti-
seize compound on yesterday evening (I didn't do so prior, just in
case I had to return the item.)

And the dealership said "Oh it's a FUEL AIR RATIO SENSOR, not an
OXYGEN SENSOR... that's why it costs $225." (when I asked if they
could price-match the item from toyotadiscountparts.com)

Fear, obfuscation and doubt... just what the dealership needs to make
more $$$...

Michael

LOL. Maybe that dealer also sells snake oil.



On May 21, 8:50 am, mrdarr...@gmail.com wrote:

No, AutoZone lends sensor socket sets, not sensors.

You may notice reduced HC emissions. e.g., top of the range down to
the clean end of the range. Not sure about mileage, but if running
rich I'd think so.



On May 19, 10:38 pm, mrdarr...@gmail.com wrote:

Well if you ever need one get the Bosch *planar* one (15733 universal
$75 or $20 more with OEM connector. Autozone can loan you the tools
free and you can find a mechanically inclined friend to help out.



On May 19, 8:42 pm, norm46 <nrow...@roadrunner.com> wrote: