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OK guys, I see alot of questions and problems with Primary O2 wiring.
This thread will show you the correct info to check your conversion harness if you are having problems. This should help out several members. This little pic is the wire side of the primary O2 sensor plug. Clip is above the 1 & 2 positions. Pins & plug facing away. Wires coming out towards you.

Image


1 2

3 4

The 4 wires on the Primary O2 need to go to:

1 - Primary O2 Signal (+) (white / red on my harness)
Continuity to C101 pin 19, from there the wire goes back over to ecu A6 where it delivers signal info to the ecu.

2 - Primary O2 Ground (-) (green / blue on my harness)
Continuity to C101 pin 13, from there the wire goes over to ecu A16 which is a sensor ground.

3 - Primary O2 Heater Signal (+) (yellow / black on my harness)
Continuity to C101 pin 15 (from there the wire goes over to ecu A22)
*NOTE: This wire is also divided and is tied into a relay. I will add the relay information a little later.

4 - Primary O2 Heater Ground (-) (orange / blue on my harness)
Continuity to C101 pin 10 (from there the wire goes over to ecu pin A1)
However In some swap harnesses I have seen this wire pinned directly to K-series ecu pin E4. That also works as an appropriate heater ground.

*NOTE: 1 & 2 MUST be wired to the above correct locations for KPro to properly read and display the A/F readings.
*NOTE: 3 & 4 Can be reversed. The heater will still operate without any problem.
Thanks Mike!
 
If anyone can help me, I have had this problem for years, and I could never solve it.
The difference is that I have everything perfectly connected as mike explains, my o2 works perfect only a few months and then it burns and my a / f is dead in 28, I have changed 4 denso o2 oem sensors, they work well for me only a few months, I don't know which is what happens that they burn.
any suggestions that could be happening?
 
Are you in stock location between 10 and 2 o'clock? Is your tune good?

Poor tune can kill a wide band. Also mounting below horizontal can kill them with condensation accumulation.
Yes my o2 is in perfect position and my tune is also fine, my wideband is in the same position for years and I never burned, I don't know where else to look for the problem
 
sorry to revive an old thread, this seems straight forward to me but i wired it like so and clearly am wrong, (grey wire to c101 pin 19, red wire to c101 pin 13, white wire to c101 pin 15 and black wire to c10110) AFR reads 10.7 and throwing code P1166, k24a2 in a 91 MR2

thanks

 
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