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  1. #1

    Default Where's the o2 sensor

    1987 r-20 with 254ci

    i can't seem to find the O2 sensor. Any help?

  2. #2
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    Did they even use 02 sensors back then?? I don't think they did, but besides the point what is an r-20??
    2004 Chevy Colorado
    LS1 5.7 swap/TBSS rear axle swap

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