What kind of o2 sensor is this Options

[6gsillyca]

Can anybody tell me what kind of oxygen sensor this is, and what type of car/engine it is used for?

I have a 98 celica chassis with a jdm 93 sw20 3sgte swapped in. I ordered a replacement o2 sensor for a 93 mr2t, figuring the ecu would need a 93 3sgte sensor.

Well my replacement sensor has 4 wires, and the clip has 4 electrical contacts. The one currently installed has 1 wire w/ 1 contact. I searched online, but it looks like the 5sfe uses a 2 wire sensor, so what do I have?

edit:
I did a bit of searching on mr2oc, and it seems that the OEM replacement IS indeed a 4-wire sensor, but there have been a few other members that have 93 jspec 3sgte's that came with 1-wire o2 sensors, so now I'm not sure if I should be looking for...a 1-wire 5sfe sensor or a 1-wire 3sgte sensor. I don't know why toyota would put different sensors between USDM and JDM 3sgte motors though (assuming that the sensors are OEM).

Does anybody have any experience with universal sensors?





This post has been edited by 6gsillyca: May 8, 2008 - 10:23 PM

[alltracman78]

The sensor is different because of emissions.
3+ wire sensors have heaters in the sensor, so it will start reading quicker.
O2 sensors have to be at several hundred degrees before they'll read correctly.

For whatever reason Toyota ran 1 wire for JDM cars, but ran 4 wire for USDM cars. It wasn't mandated by law, because the 5S of the time had a single wire sensor.

They'll have the same signal, once they're both warmed up.

You should be fine running an early 5SFE sensor, though the connector is probably different.

It generally the 4 wire o2 sensers is used on a newer car after the catalytic converter. The one you want is the pre catilytic converter senser.

If anything, the sensor BEFORE the cat has more wires. Most cars with 2 sensors have 4 wire ones on both.
Early cars that had 2 sensors ran a single wire sensor after the cat, at least as far as Toyotas go.