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Thread: Where is the location of my Oxygen Sensor?

  1. #1
    Join Date
    Jul 2011

    Default Where is the location of my Oxygen Sensor?

    I have an error code PO141= Definition HO2S-12 (Bank 1 Sensor 2) heater Circuit malfunction. Where would I find that Oxygen Sensor on a 2004 Oldsmobile Silhouette? V6, 3.4L (207 CID) & how to reach it? Thank you.

  2. #2
    Join Date
    Jan 2007


    Hi CalKatKaa,

    The downstream O2 sensor is located in the exhaust pipe, after the catalytic converter. It's shown in Haynes manual 38036, Chapter 6, illustration 11.6b.

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