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Early/Late O2 Sensors

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    Early/Late O2 Sensors

    I have a nearly new early model 325i 4-wire O2 sensor I'd like to use on a late model wiring harness. They have different connectors. I need to splice the connector anyways to extend it because of my long tube headers.

    Are the O2 sensors the same besides the connector?

    RISING EDGE

    Let's drive fast and have fun.

    #2
    if it's a 4 wire heated sensor, yes they should be the same.

    two grounds, one signal, and one for heater power.
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      #3
      There's a black, grey, and 2 white wires on each. Only visual difference is one has a screw-together connector, and one is snap together. I'd imagine the 2 whites are the grounds and can be interchanged?

      RISING EDGE

      Let's drive fast and have fun.

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        #4
        yeah I believe the whites are grounds. I don't recall which is power/signal. On the engine harness side, the yellow shielded wire is for the signal, if that helps you figure it out.
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