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O2 sensor help.. [Archive] - Toyota MR2 Message Board

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O2 sensor help.. [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > Toyota MR2 Generations > MK 2 MR2 - SW20 > MK2 Stand-Alone EMS and Nitrous Discussion > O2 sensor help.. PDA

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turbonatormr203-11-2006, 12:17 AMI have a Bosch o2 sensor that I am trying to splice into to connect to the stock sensor connector. Does anybody know which wires to splice into to make it work properly.

Here is what I have
On the Bosch sensor, the wires are as follows:

2 White wires are for the heater. 12v, it doesn't matter which is + and which is -
Black is EGO + signal
Gray is EGO - signal

On the stock 02 sensor itself the wires are as follows.

1 blue wire
1 white wire
2 black wires Nepherim03-11-2006, 11:43 AMThe 2 black wires are for the sensor heater, the white is the O2 sensor output, and blue is the ground. turbonatormr203-12-2006, 05:22 PMThe 2 black wires are for the sensor heater, the white is the O2 sensor output, and blue is the ground.


Are you positive. Here are some pictures of the sensors. The black one is the Bosch 02 sensor and the gray one is the stock Mr2 sensor.

http://img63.imageshack.us/img63/5553/motorpicturesin0315rf.jpg

http://img141.imageshack.us/img141/5278/motorpicturesin0355np.jpg Weasy2k03-13-2006, 11:48 AMPin 3 - W = OX1 Signal Wire
Pin 2 PB Pink/Blk = HTB (12v + Switched)
Pin 4 - BR = Ground
Pin 1 - BY Blk/Yel= HTR ECU Gnd trigger for heater

So pins 1 and 2 are both heater signals
Pin 3 is for the 5v signal to the ecu
Pin 4 is ground

The colors may not match but you can use a multimeter to check the rest or look on the plug and see if there is number markings on it turbonatormr203-13-2006, 03:28 PMPin 3 - W = OX1 Signal Wire
Pin 2 PB Pink/Blk = HTB (12v + Switched)
Pin 4 - BR = Ground
Pin 1 - BY Blk/Yel= HTR ECU Gnd trigger for heater

So pins 1 and 2 are both heater signals
Pin 3 is for the 5v signal to the ecu
Pin 4 is ground

The colors may not match but you can use a multimeter to check the rest or look on the plug and see if there is number markings on it


Ok! so you are saying connect the two white wires to the two black wires and
the blue wire to the gray wire and the white wire to the the black wire. Is that correct Weasy?. turbomr203-13-2006, 06:43 PMI just did this. If you have the instructions look at type B. I believe it goes like this:

Blue -- Black
White -- Gray
Black x2 -- White x2 turbonatormr203-14-2006, 08:38 PMI just did this. If you have the instructions look at type B. I believe it goes like this:

Blue -- Black
White -- Gray
Black x2 -- White x2

I dont have the instructions but I after studying it closely I think you are right.


Here how the wires go.
On the stock sensor the wires match up like this to the connector.

brown/yellow on connector = the black wire on the 02 sensor (heater)
red/yellow on the connector = the other black wire on the 02 sensor (heater)
solid black on the connector = the blue wire on the 02 sensor it self is the +
solid brown on the connector = the white wire on the 02 sensor it self is the -

So there for you would be correct.

Ok so just in case it's wrong wich I really doubt. What would happen if I connected it was wrong? Woul I blow my ECU?.

On the Bosch 02 sensor the wire go like this
2 white wires are the 12v
black is EGO + signal
Gray is EGO - signal

So it the wires would connect like this.
2 blk to the 2 white ones
blue to black
white to gray

Just like you said.:D Powered by vBulletin® Version 4.2.5 Copyright © 2026 vBulletin Solutions Inc. All rights reserved.

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