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Thread: O2 sensor location on early cars

  1. #1
    Join Date
    Dec 2007
    Location
    orange, ca
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    2,507
    My Cars
    '91 e31

    O2 sensor location on early cars

    Got the new sensors and cats ready to go on the car next week -
    The walker cats have threaded holes - O2 sensor supposed to go there or upstream in the exhaust somewhere else? (Want to make sure I have all my ducks in a row before bringing it to a friend's shop)

  2. #2
    Join Date
    Jul 2014
    Location
    Westfield, IN
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    1,313
    My Cars
    '91 e31 M70
    Looks like you have a ‘91. I️ still have OEM cats in my ‘91 and the O2 sensors are on top of the cats. There are no upstream sensors on the ‘91.


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  3. #3
    Join Date
    Sep 2008
    Location
    Santa Barbara
    Posts
    3,462
    My Cars
    91 Dinan860 & 91 850 6sp
    "Upstream" literally means right before the cats, the O2 brings are on the intake side of the cats. You're good

  4. #4
    Join Date
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    '91 e31
    Beautiful - thanks!

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