Replacing O2 Sensors. Which do I get?

[haux]

I want to replace both front and rear oxygen sensors. I'd like to go with the OEM Denso's, and I don't wanna have to splice on the old connectors. I've read some recent talk in the forums about this, but I'd like to be sure of what it is I am buying.

Looking at RockAuto -> http://www.rockauto.com/catalog/x,ca...,parttype,5132

There are four different Denso sensors, which two should I get, where it will already come with the proper connector?

[JohnGD]

The first one, 2344209, is a universal (need splicing wires). It can be used as an upstream or downstream sensor on a Non-California emissions vehicle, or as a downstream sensor on Calif emissions vehicles.

The second one, 2344137, is a downstream sensor for both Calif and Non-Calif emissions.

The third one, 2344626, is an upstream sensor for Non-Calif emissions.

The last one, 2349010, is an upstream sensor for Calif emissions.

You are in Oklahoma, and "probably" have non-Calif emissions. However, make sure by looking at the emissions sticker under the engine hood. It'll tell you if it's Calif or non-Calif (Federal) emissions.

(So you are changing oxygen sensors and already the canister VSV??)

Originally Posted by haux

I want to replace both front and rear oxygen sensors. I'd like to go with the OEM Denso's, and I don't wanna have to splice on the old connectors. I've read some recent talk in the forums about this, but I'd like to be sure of what it is I am buying.

Looking at RockAuto -> http://www.rockauto.com/catalog/x,ca...,parttype,5132

There are four different Denso sensors, which two should I get, where it will already come with the proper connector?

[haux]

I'll check that tonight. Although Oklahoma has no vehicle inspections (I think they did many years ago), so I assume the non Calif ones will suffice. Might get the Calif ones anyway.

Yes, I want to order the O2 sensors tonight. I put the VSV on today, but as my DIY thread showed, I wasn't able to remove the old one. I think I will try to take down the entire Charcoal Canister so that I can have full access to that rusty screw. And I will probably need to have my dad drill it out.


EDIT: One of the stickers under the hood says (in other words) that it's not meant for sale in California. So, non-California emissions.

Originally Posted by JohnGD

The first one, 2344209, is a universal (need splicing wires). It can be used as an upstream or downstream sensor on a Non-California emissions vehicle, or as a downstream sensor on Calif emissions vehicles.

The second one, 2344137, is a downstream sensor for both Calif and Non-Calif emissions.

The third one, 2344626, is an upstream sensor for Non-Calif emissions.

The last one, 2349010, is an upstream sensor for Calif emissions.

You are in Oklahoma, and "probably" have non-Calif emissions. However, make sure by looking at the emissions sticker under the engine hood. It'll tell you if it's Calif or non-Calif (Federal) emissions.

(So you are changing oxygen sensors and already the canister VSV??)

[haux]

Err, I should have probably asked before. Should I stick to the non-Calif upstream sensor since my Camry doesn't follow Calif emission standards, or does it not matter which one I get?

Is there any benefit to getting the Calif sensor, or could it possibly have a negative impact on the vehicle?

[bronzemaxell]

Oxygen Sensor is being used for Federal emission vehicle, and A/F ratio sensor is normally used for California,
and they are not interchangable, narrow band vs wide band.
you must find out if your vehicle is Fed or Cali emission before you buy,
i mean physically you can install either sensor on the exhaust becuse the size of thread is identical, but incorrect sensor cause Check engine light, and poor MPG or engine performance, because it is not just the oxygen sensor make it non-cali spec, there are ECU, CAT and many other components are different.

[RU2CHKN]

how do you disconnect the oxygen sensor located on the resonator? I looked under the car and can't find the connector to disconnect

[Hajoca]

The connector is actually under the drivers seat, then the wire passes through a rubber grommet in the floor to the exhaust piping after the catalytic converter.

[Dick Tuck]

The NON CA sensors are cheaper (I have two with the CA setup and I live in New England! non CA is a savings of at least 50 bucks for the front one- wish mine were non CA - the CA front seems to last about 100K and BOSCH, which sells a repackaged Denso says "100 K" right on the box) Once you get a look at what it takes to change the rear you may decide that the "universal" is easier to use because you do not have to go digging around inside the car to get to the conector. Their splice kit is pretty good and you CAN solder the wires if you wish to.

[Dick Tuck]

The "universal" Denso is the OEM sensor with pigtail wires and a splice kit, instead of the "Toyota" connector. Cheaper and easier IMHO to install. You're going to be under the car anyway.

[Dick Tuck]

Just to make this clear (I hope) the FRONT sensor on a CA car is special and expensive, but you have to use it. The REAR, CA or Federal (non-CA) is the same sensor on both cars and the Federal cars use that same sensor on the front as well. SO, you need a special sensor for the CA front but BOTH use the same rear. Must be why my fronts last about 100K but one of my rear sensors has gone 240 K .

[RU2CHKN]

Originally Posted by Hajoca

The connector is actually under the drivers seat, then the wire passes through a rubber grommet in the floor to the exhaust piping after the catalytic converter.

I got a 94 Camry V6 so wouldn't the connector be under the passenger seat?