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92 lexus 02 sensors wire diagram question

Hi, i have 2 new in the box 2002 FORD Taurus precat 02's.
2 white wires
1 black
1 grey

i have a an old 92 Lexus sc 400 with 175K on the car and the pre cat 02's are bad.
2 black wires
1 white
1 blue.

I wish to solder in the new o2s that i have and keep the car goin'. I plan to pull the efi fuse, solder them up and see the check engine light go away. I know for a fact the pre cat o2's are the problem. A dealer diagnosed this. The resistance readings between the 2 black wires on the old 02's reads 6.5 ohms on the 200 scale.

the new in the box 02's for the taurs read (between the two white wires) read 3.5 using the same scale. I wish to solder /merge the two and would like to know which wires go with what. I believe the twin whites on the new 02's and the twin blacks on the old are the heater wires. I'd appreciate your help, can't find wire diagrams very easy online....maybe you could assist with a good website as well? sturgeonman@sbcglobal.net. thanks!

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  • Sturgeonman Nov 11, 2007

    Thanks much. This helps alot. This was also confirmed last night when i went to Auto Zone. There i looked at a universal O2 for the Lexus. There was an instruction sheet with wire color explanations. You see, i'm going to solder in the Ford O2 to the lexus pigtail and connector. I appreciate your helping me with this.

  • Anonymous Mar 26, 2014

    it has a black, white, blue and green wires coming off board which are labeled black, white, blue and green. Not kidding!

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  • Master
  • 883 Answers

I just checked the ford's..3 liter,12 valve....i see car has four o2's and all identical with heater inside.. i also found the lexus....i tried attaching a screen shot of each wiring..but size limits prohibit...i looked at wire colors...they don't agree ford to ford and lexus to lexus nor cross breed colors...on lexus are four pins..
pin 1 is heater
pin 2 is battery pos (looks like other end of heater filament)
pin 3 is sensor out
pin 4 is ground (possibly sensor)

on ford...
pin 1 is battery pos (looks like other end of heater filament)
pin 2 is heater
pin 3 is sensor out
pin 4 is sensor out

hope this helps...

Posted on Nov 11, 2007

  • Marty marty Nov 12, 2007

    ok, I'm glad that you are...can you submit a rating?

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