97 ETC Head Gasket Project - Page 4
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Northstar Engines and System Technical Discussion Discussion, 97 ETC Head Gasket Project in Cadillac Engine Technical Discussion; Thanks for the input, by the way can someone tell me if the codes are for upstream or downstream sensors. ...
  1. #46
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    Thanks for the input, by the way can someone tell me if the codes are for upstream or downstream sensors. Thanks

    P0138 - Bank 1 sensor 2
    P0151 - Bank 2 sensor 1

  2. #47
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: 97 ETC Head Gasket Project

    p0151 = Denso 234-4018 or Bosch 13474

    P0138 = Denso 234-4025 or Bosch 13444


    P0138 is Left side/Front DOWNSTREAM SENSOR

    P0151 is Right side/Rear UPSTREAM SENSOR

  3. #48
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    Bank 2 sensor 1 is the front exhaust manifold sensor.

    Bank 1 sensor 2 depends on what year you have (you don't list it in your profile). If it is a 4 sensor car (pre '98 or '99) it will be the pre-CAT sensor. If you have a 3 sensor car (post '98 or '99), it will be the aft-CAT sensor.

  4. #49
    98eldo32v's Avatar
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    Re: 97 ETC Head Gasket Project

    It seems the northstar banks are reversed.

    Nonetheless, you need one upstream and one downstream sensor.

  5. #50
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 97 ETC Head Gasket Project

    In a 4 sensor engine -

    B2S1 is the left (front) bank - in the exhaust manifold collector
    B1S1 is the right (rear) bank - in the top of the exhaust manifold
    B1S2 is the pre-cat sensor
    B1S3 is the after-cat sensor.

    In a 3 sensor engine there is no pre-cat sensor. The after-cat sensor becomes B1S2.

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