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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.

  6. #51
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    Hey Guys,

    Hope all is well.....I had to put this project on hold and is now back to finish the job. The car is running awesome, but the codes have changed somewhat since the last time I posted.....

    This is from October of last year:
    P0138 - Bank 1 sensor 2
    P0151 - Bank 2 sensor 1
    P1645 - Evaporation Emission (EVAP) Vent Solenoid Control Circuit

    I had the codes scanned at a shop last week and got the following codes:
    P0138 O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)
    P0441 Evaporative Emission Control System Incorrect Purge Flow
    P0154 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
    P0151 Oxygen O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1)
    P1645 Evaporative Emission (EVAP) Vent Solenoid Control Circuit

    A couple days ago, I cleared the codes and drove car about 20 miles and got the following codes from the OBD:
    P0131 Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
    P0151 Oxygen O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1)
    P0441 Evaporative Emission Control System Incorrect Purge Flow
    P1645 Evaporative Emission (EVAP) Vent Solenoid Control Circuit

    My question is, should I drive it some more and re-check the codes on the OBD?
    Which one is more accurate to go by, the one on the OBD or on the scanner tool because one suggest Bank1,Sensor2 while the other states Bank1,Sensor1?
    What are your suggestions for these fixes (check wiring, fuses, replace o2's, etc)?

    Thanks very much

  7. #52
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: 97 ETC Head Gasket Project

    Check your OXY SEN fuses first before you do any of the O2 sensor work. If blown, see if the wiring is damaged by chaffing on the body.

  8. #53
    Eldorado_RED is offline Cadillac Owners Member
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    Re: 97 ETC Head Gasket Project

    will do, thanks maeng9981

    Quote Originally Posted by maeng9981 View Post
    Check your OXY SEN fuses first before you do any of the O2 sensor work. If blown, see if the wiring is damaged by chaffing on the body.

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