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  • karjunkie 08/03/09 8:23 am PST

    Might help to know what vehicle we're talking about...:)

  • bowhunter33 08/03/09 1:12 pm PST

    2002 chev. s-10 4wd 4.3l pickup

  • karjunkie 08/03/09 1:42 pm PST

    I believe that is the oxygen sensor on the driver side engine bank on the exhaust manifold before the catalytic converter.

  • scottys_garage 07/26/15 12:15 pm PST

    Passenger Side before the Cat.
    O2 Sensors are Sensor 1 before Cat, Sensor 2 After Cat, at some Auto Parts stores they also refer to them as upstream and downstream. Upstream being before the Cat and Downstream being After. Buy the O2 Sensor Socket , it's well worth the investment.
    Good Luck

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