O2 Sensor Trouble.

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  • e30_jake
    Noobie
    • Mar 2019
    • 12

    #1

    O2 Sensor Trouble.

    So recently I've been looking for a O2 sensor for my '91 BMW E30 318ic. I recently bought a slew of parts of which one was a 4 Wire O2 Sensor, Alas when it arrived I found my AFM and current O2 Sensor are 5 Wire, and I cannot seem to find a sensor that is compatible. All that I seem to be finding are 4 wires and the few 5 wires i find don't look the same as what I currently have. If anyone has any idea where I could find the correct sensor I'd appreciate it.
  • roguetoaster
    R3V OG
    • Jan 2012
    • 7754

    #2
    What? The oxygen sensor on the car is a 4 wire, and has a similar plug to the AFM, but isn't near it.

    The connector is in the engine bay on the passenger side, possibly still below the battery tray, and it has 4 terminals. If the original connector on the car side of the loom still exists you can get a direct fitment sensor with the correct plug from any reputable vendor, otherwise you can splice in just as I suspect that the current sensor has been installed.

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    • TobyB
      R3V Elite
      • Oct 2011
      • 5169

      #3
      The only way you'd get a 5- wire sensor is if you had an AFM and post- 95 318ti electronics swap done.

      Meter your current sensor- is pin 5 just tied to case ground?

      e30_t
      now, sometimes I just mess with people. It's more entertaining that way. george graves

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