Question about 2004 Buick LeSabre

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Replacing O2 Sensor What color are the original: Wires

I need to know the color for the wire from the O2 sensor to the computer, the color from power source to the O2 sensor, the color of the power for O2 heater and the color of the ground for the O2 heater.

2004 Buick LeSabre

I have a Bosch replacement, not original, so the colors do not match. and need to splice wires to the original plug.

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  • art_cobb May 13, 2009

    I Have Purple , 2 Brown, 1 light- off white, maybe tan.

  • art_cobb May 14, 2009

    Thanks, That should Help, I appreciate the help.



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  • 147 Answers

Black is usually power and if there is a blue its the feedback to the pcm

Posted on May 13, 2009

  • kris vis
    kris vis May 14, 2009

    ok 2004 lesabre I can access the technical info tomorrow at the shop I will give the info and instructions

  • Jessica Bearfoot
    Jessica Bearfoot Apr 05, 2013

    theres a black,a blue with orange stripe, a orange with green stripe and a tan with white stripe



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Locate the wires running off from the O2 sensor. There should be two. The black wire is the ground wire. The other wire, which may vary in color, supplies power to the sensor.

  • 2 Connect the power lead to the corresponding connector on the chassis's wiring harness.
  • 3 Connect the black, or ground, lead to the corresponding connector on the factory wiring harness.
  • 3 wires, "how do i wire it" are simply explained. all universal 3 wire o2 sensors will have 2 wires one color, the other wire a different color. the 2 that are the same color are ground and power for the heater and it doens't matter which one is which. so ground to the motor, power from the gray wire on the fuel pump, or anywhere you want to pull 12 volts while the car is running. i have a dedicated fan relay that doesn't use the ecm and runs off the key, so thats where i went. the different color wire goes to the stock sensor wire, it's the signal.

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