99 eldorado 02 sensors

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Northstar Engines and System Technical Discussion Discussion, 99 eldorado 02 sensors in Cadillac Engine Discussion; Can someone tell me how many o2 sensors are in a 99 cadillac eldorado are and there location in the ...
  1. #1
    jenn_souza81 is offline Cadillac Owners Member
    Join Date
    Oct 2013

    99 eldorado 02 sensors

    Can someone tell me how many o2 sensors are in a 99 cadillac eldorado are and there location in the vehicle please??

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: 99 eldorado 02 sensors

    You probably have 4.

    Bank 1 is the right (rear) cylinder bank
    Bank 2 is the left (front) cylinder bank

    B2S1 is in the left bank exhaust manifold collector
    B1S1 is in the right bank exhaust manifold top
    B1S2 is in the pipe just ahead of the cat
    B1S3 is in the pipe just after the cat

    In the 2000 and later engines there is no pre-cat sensor, so the after-cat one becomes B1S2.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: 99 eldorado 02 sensors

    Wouldn't swear to it, but I seem to recall Cadillac dropping the pre-CAT sensor between '98 & '00 (my '97 still had it).

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