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Replacing the O2 Sensor

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  • Replacing the O2 Sensor

    Given where the O2 sensor is located, what's the best strategy for access and removal? From the top of the engine bay (doesn't look easy), or from below (access looks limited). Appreciate any feedback.

    Thanks,
    Mark
    1990 M3

    Usually it's best not to know how much money you have into your M3

  • #2
    It’s been a while but I recall using an o2 sensor socket and a series of extensions / swivels to get it out from the top.

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    • #3
      The previous comment is the way I do it.
      Larry

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      • #4
        oxygen sensor socket is 100% required. i just did one, a couple months ago, and i got it from the top side, with a long extension, and possibly, a u-joint, IIRC.

        A
        Autobahn Motorsport - Restoration and Service - Portland, Oregon
        503.967.3800
        '72 2002 pickup | '88 M5 | '89 330is | '89 M3 | '01 Z3 M | '11 328xi-t

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        • #5
          I was able to remover mine easily with a flex head 22mm O2 sensor wrench (from the top) after moving the coolant overflow tank out of the way. WBO2 went back in with the same wrench with no issues. I think the wrench was about $20. No extensions needed. This is the exact one I used but it is currently OOS: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

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