SR20det O2 sensor

[xtypical360aznx]

So i just bought a sr20det powered 89 240sx. its a 91 red top sr20det. but the guy put a S14(T28) on it. He told me i needed the S14 oxygen sensor. Well i looked it up and it a skinny one and the fatty one which do i get? I know the skinny is for the S13 red top and the fat is the S13 black but whats for the S14?

[Ohsoclean240]

depends on the turbo elbow... which elbow is on the turbo?because thats where the o2 sensor goes

[ILikeMy240sx]

no it doesnt not depend on the type of elbow you have. It depends on what type of ECU you have because skinny and fat oxygen sensors communicate differently with your ECU. Skinny ones are Titania sensors and the fat ones are Zirconia.

Anyways, if you have a redtop ECU you need the skinny O2 sensor. If your elbow has a hole for the fat O2 sensor, you need to buy a O2 sensor bung adapter like the ones they sell in Enjuku and use the skinny type.

[Ohsoclean240]

true, forgot about that. lol

i guess i left the other half out. but he surely cant fit a fat o2 sensor in the red top elbow myself

[xtypical360aznx]

ok is there a way to find out cause this dude didnt tell me anything. and he wont pick up his phone. well he put a giant screw into where the o2 sensor went and well i dont know how to find out if im runnign a black or red top, ive got a red top with a T28 and i believe a S14 elbow. can i like pull the screw out and measure soemthing cause i dont want ot pay for a 95 dollar part and not have it fit

[ILikeMy240sx]

so you dont have an O2 sensor right now? Thats not good. I believe the fat ones are 18mm threads and the skinny ones are like 14mm ? dont count on that tho because I am not sure.

What is the number on your ECU? This will tell us what O2 sensor you should be running. 62 or 63 is a redtop ECU.

[xtypical360aznx]

how sure are you on thoses measurements?

[91RMKS13]

Sorry to bring such an old thread back from the dead, but all these o2 threads are confusing me. I just got a 92 240 with a finned redtop running on the ecu labeled "62". Now looking at the o2 sensor that is on the car. it looks like the one on the right in this pic V.Which is what I just bought and which I am waiting to install. But from what I keep reading. it seems as though I need the o2 sensor on the right in this pic.

So which is it? and if I do need the skinny one what do I need to instal it in place of the fat one that is in the car?

[SpeedRacer1]

S13 redtop leftS13 blacktop right

[91RMKS13]

S13 redtop leftS13 blacktop right

I was told that the finned redtop was the same as the as an S13 Blacktop.Also I thought that the sensor the car uses depends on the ecu being used.

[SpeedRacer1]

Allright think of it like this:

All redtops came with 62 or 63 ECU's.The early model blacktops came with E5 or E6.

The redtop was made from Jan 1991-Jan 1994. The finned redtop appeared around June 1993.

The early model blacktops were made from Jan 1994-Aug 1996.

The late model S13 blacktops were made from Aug 1996-Dec 1998.

You are correct that the O2 sensor has to go with the proper ECU. You are incorrect in assuming that the finned redtops use blacktop ECU's. The finned redtops still use 62,63 ECU's. The S13 SR20DET ECU didnt change until Jan 1994 when the blacktop debuted.

[91RMKS13]

Thank you a lot. I didn't think the finned red top and the blacktop had the same ecu. Just some of the same hard parts such as pistons and what not. Being that this is my first SR I have noticed that some of my knowledge on them is laking, but that is why I am a member here. So...

Thanks again for clearing up the confusion that some of the archived threads have caused.

[240dk]

well i was unawhare that it made a difference with the type of o2 sensor used, i have a sr20 redtop and my after market elbow needed a big 02 sensor so thats what i bought. would that explain why my car ran so rich?

[SpeedRacer1]

Thats possible, I dont know the exact differences in the electrical outputs of the O2 sensors. Whether they just send off different ranges of voltage or totally different units of electricity, but that could have been a part of your problem.

[JustAOldMan]

Thanks for the information, I am also trying to understand which O2 sensor is the proper match for the 23710-50F00 62 ECU SR20DET RedTop. The original Nissan O2 sensor is marked NTK D2F, and has 12mm threads and requires 17mm hex wrench. (Some of the O2 images on Ebay show D2F on the skinny sensor)

The O2 sensor is the skinny type, but the local Nissan Dealers will/can not order the 22690-50F00 part number and it is unclear if I need a Zirconia sensor or a Titania sensor.

I understand if it is a Titania sensor that ECU pin 19 of the 23710-50F00 62 ECU would have a bias voltage because a Titania sensor is a voltage divider (resistor type fast acting).

I also understand that a Zirconia sensor is a voltage generator and there should be no bias voltage on pin 19.

My problem is that with the ignition on there is no bias voltage on 23710-50F00 62 ECU pin 19. I don't know if the ECU O2 circuit is bad.

Anyone know what bias voltage I should see on 23710-50F00 62 ECU pin 19 with the O2 sensor unpluged and the ignition on ?

The SR20DET failed the smog test because it is running Soooo rich.

I have found a Bosch O2 Sensor P/N 13021 that is a heated 3 wire Titania sensor and it is made by NTK just like the original sensor with the proper connector for under $60.00USD.

Thanks in advance

David

[GoTRicEo0]

Wish I knew this earlier before I got a Skinny O2 sensor for a Blacktop. Can't really tell the difference tho.

[drftsx]

well i have a blacktop with a skinny o2 sensor according to you guys its not the right thing, but id like to know what difference does it make?? if any. i have a redtop elbow so i dont think i can put my big o2 sensor on it.