Oxygen sensor questions

[bdy0003]

I bought a Denso 234-1057 oxygen sensor and I have some questions about it. The old oxygen sensor's housing (the part that sticks out when installed) is a lot longer and fatter than the new one. Is there something wrong here?

Also, whats the torque on the screws?

BTW, I have a 95 4 banger CA emission.

[fenixus]

Originally Posted by bdy0003

I bought a Denso 234-1057 oxygen sensor and I have some questions about it. The old oxygen sensor's housing (the part that sticks out when installed) is a lot longer and fatter than the new one. Is there something wrong here?

Also, whats the torque on the screws?

BTW, I have a 95 4 banger CA emission.

is this denso sensor federal or california spec ? california spec uses bigger A/F sensors for upstream while federal uses small narrow band o2 sensors. i think you might have picked the wrong one. A/F are much more expensive than o2.

torque is around 32ft-lbs or around 3/4 to 1 turn from gasket contact.

[bdy0003]

The website doesn't say, so I'm assuming its federal spec. Also, I don't think they have one specific for CA on their website, unless someone can give me a part number.

Originally Posted by fenixus

is this denso sensor federal or california spec ? california spec uses bigger A/F sensors for upstream while federal uses small narrow band o2 sensors. i think you might have picked the wrong one. A/F are much more expensive than o2.

torque is around 32ft-lbs or around 3/4 to 1 turn from gasket contact.

[fenixus]

Originally Posted by bdy0003

The website doesn't say, so I'm assuming its federal spec. Also, I don't think they have one specific for CA on their website, unless someone can give me a part number.

yeah i think you're right. just checked NGK parts and they do not seem to have different one for california vs federal. not sure why your new sensor looks different. for sure downstream part number is different from upstream. i think california upstream A/F sensors were introduced with gen4. let's see if someone knowing gen3 better can confirm.

[bdy0003]

I'm looking at the denso website now comparing 2000 camrys. They definitely have a CA A/F sensor and federal O2 sensors (I'm only talking about upstream). The AF sensor sure doesnt fit my car cause it has 2 wires/4 pins while mine only uses one wire.

Any thoughts of what I should do? Should I go ahead with the replacement?

EDIT: I looked at the O2 sensors for 96 and they are different. The front one has 2 wires/2pins AND the housing is larger. My current one's housing looks the same size, however has 1 wire.

Originally Posted by fenixus

yeah i think you're right. just checked NGK parts and they do not seem to have different one for california vs federal. not sure why your new sensor looks different. for sure downstream part number is different from upstream. i think california upstream A/F sensors were introduced with gen4. let's see if someone knowing gen3 better can confirm.

[fenixus]

Originally Posted by bdy0003

I'm looking at the denso website now comparing 2000 camrys. They definitely have a CA A/F sensor and federal O2 sensors (I'm only talking about upstream). The AF sensor sure doesnt fit my car cause it has 2 wires/4 pins while mine only uses one wire.

Any thoughts of what I should do? Should I go ahead with the replacement?

hmmm, if Californian A/F doesn't fit (different plug) then you cannot have Ca emissions car ... or someone else put wrong sensor over there and modified the socket ? weird.

where is your upstream sensor lcoated in exhaust manifold heat shield ? top center of bottom shield (california) or rather right bottom spot down there (federal). go with whatever is supposed to go into your car or ECU might go nuts on fuel trims.

pic of CA emissions gen4 5s-fe:

[bdy0003]

Mine isn't exactly there. ITs located on the other part of the heat shield, close to the hand symbol.

Positive its CA b/c its never left the state. It might look different from yours cause yours is a Gen 4 (PCV is in a different spot).

Originally Posted by fenixus

hmmm, if Californian A/F doesn't fit (different plug) then you cannot have Ca emissions car ... or someone else put wrong sensor over there and modified the socket ? weird.

where is your upstream sensor lcoated in exhaust manifold heat shield ? top center of bottom shield (california) or rather right bottom spot down there (federal). go with whatever is supposed to go into your car or ECU might go nuts on fuel trims.

pic of CA emissions gen4 5s-fe:

[fenixus]

i see. i think yours is california for sure then hehe, just noticed you are from there
gen3 component locations are a tad different, so i think yours must be cali. i'm a little worried why your new upstream denso sensor looks different then.

this site however doesn't show A/F sensors for your model at all ...
http://www.densoaftermarket.com/cata....php?part=o2sn
"No Air Fuel Ratio Sensor results. We may not make this part for this application." and the one you ordered seems correct ... but ... it's not the A/F sensor, but NGK didn't list them either i think.

i'm stumped. can some gen3 expert confirm that California emission car has normal (narrow band) o2 sensor upstream and not the A/F sensor ?

i think OP can safely install his new o2 sensor if the number of wires to it is correct. have no idea why his old sensor is different - is it Denso too ? what part number ?

[JohnGD]

It's an unheated thimble sensor. I'm surprised Toyota was still using that in 1995. BTW, you got a "universal" type that requires you to splice on the old connector. No big deal.

Hey, maybe you got a Bosch sensor from the factory:
http://www.rockauto.com/catalog/moreinfo.php?pk=279265

http://www.densoaftermarket.com/cata...1057&part=o2sn

You should be fine according to Denso's catalog. Also, according to the Bosch catalog, they're the same sensor (both Calif and Fed).

12102 Oxygen Sensor - OE Type - Exact Fit - Upstream Sensor Except California emissions; 1 Wire; Unheated; Check / Replace Interval: 50,000 Miles L4 2.2 5SFE GAS
12102 Oxygen Sensor - OE Type - Exact Fit - Upstream Sensor w/ California emissions; 1 Wire; Unheated; Check / Replace Interval: 50,000 Miles L4 2.2 5SFE GAS

Originally Posted by bdy0003

I bought a Denso 234-1057 oxygen sensor and I have some questions about it. The old oxygen sensor's housing (the part that sticks out when installed) is a lot longer and fatter than the new one. Is there something wrong here?

Also, whats the torque on the screws?

BTW, I have a 95 4 banger CA emission.

[bdy0003]

Thanks. I just installed it and with my limited test drive, there has been no CEL.

[JohnGD]

It's good to hear everything is fine so far. BTW, as long as the sensor is specified for the application, then there is nothing wrong. Design sometimes changes.

Originally Posted by bdy0003

I bought a Denso 234-1057 oxygen sensor and I have some questions about it. The old oxygen sensor's housing (the part that sticks out when installed) is a lot longer and fatter than the new one. Is there something wrong here?

Also, whats the torque on the screws?

BTW, I have a 95 4 banger CA emission.