Where exactly are the B1S2, B2S1, and B1S3 O2 sensors located?
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Northstar Engines and System Technical Discussion Discussion, Where exactly are the B1S2, B2S1, and B1S3 O2 sensors located? in Cadillac Engine Technical Discussion; 1996 Deville w/N* need to know where the Bank 1-Sensor 2, Bank 2-Sensor 1, and Bank 1-Sensor 3 O2 sensors ...
  1. #1
    outlaw1369 is offline Cadillac Owners Member
    Automobile(s): 1995 Eldorado 1996 Sedan Deville
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    Where exactly are the B1S2, B2S1, and B1S3 O2 sensors located?

    1996 Deville w/N* need to know where the Bank 1-Sensor 2, Bank 2-Sensor 1, and Bank 1-Sensor 3 O2 sensors are located.

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  3. #2
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx), '04 DTS & the witch driver gone.
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    Re: Where exactly are the B1S2, B2S1, and B1S3 O2 sensors located?

    Bank one sensor two; in front of cat. converter.

    Bank two sensor one; manifold, close to head.

    Bank one sensor three; after cat. converter.

    And to close the loop, bank one sensor one; manifold, close to head.

  4. #3
    mcowden is offline Cadillac Owners Connoisseur
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    Re: Where exactly are the B1S2, B2S1, and B1S3 O2 sensors located?

    That's right, but I wanted to add that B2S1 is on the front manifold and B1S1 is on the rear manifold. So, from the front to the rear of the car, the sensors are in this order:

    B2S1 - B1S1 - B1S2 - B1S3

    Hope that gets you where you need to go.
    Mike

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