O2 sensors

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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, O2 sensors in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I recently went and got an emissions test on my 2004 CTS 3.6L they told me all 4 o2 sensors ...
  1. #1
    abossart04 is offline Cadillac Owners Member
    Join Date
    Jun 2013

    O2 sensors

    I recently went and got an emissions test on my 2004 CTS 3.6L they told me all 4 o2 sensors were bad and they needed to replace them all. They gave me a bill of 3500 bucks. The check engine light was never on. How do I tell if they are bad ( the sensors themselves)

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  3. #2
    josney's Avatar
    josney is offline Cadillac Owners Connoisseur
    Automobile(s): 2003 CTS
    Join Date
    Dec 2006
    South Carolina

    Re: O2 sensors

    swing by an autozone or something and have them scan it for you

  4. #3
    txbest1980's Avatar
    txbest1980 is offline Cadillac Owners Master
    Automobile(s): 2003 CTS "Ebony Maria" 2005 Cadillac STS "Grace"
    Join Date
    Dec 2008
    Wherever Uncle Sam sends me

    Re: O2 sensors

    $3500 to change out some O2 sensors...hell for that price i could fly to you from germany, buy the parts, replace them (although the top two can suck to change), fly home and still have made a profit...did you go to an independent mechanic or a stealership? if you are somewhat mechanically inclined, i suggest watching a How-To video on youtube and doing it yourself. if you dont have the time or ability, then find somewhere else to go to have it done if all four sensors are actually bad (which i would bet that $3500 that all four are not bad, maybe one or even two but not all four)

  5. #4
    Kingoftypos is offline Cadillac Owners Master
    Automobile(s): 06 CTS Sport/Luxury package
    Join Date
    Apr 2009
    Ledyard, CT


  6. #5
    Hannu_L is offline Cadillac Owners Member
    Automobile(s): CTS 3,2 Sport Luxury -03
    Join Date
    Nov 2012

    Re: O2 sensors

    On 03`s bad O2-sensor code usually means bad ECU. It doesn´t light up check engine lights, but emissions are bad. Alltought, if that´s the case that 3600 bucks is way of....

  7. #6
    Jim's 06 is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac
    Join Date
    Nov 2006

    Re: O2 sensors

    RockAuto lists 06 CTS O2 sensors for $35 to $165. I know labor is involved, but ~$3000?? All four went bad at the same time? And no codes are displayed? Definitely get another opinion, and if need be, report this guy to the state. This is why many states have ditched their vehicle inspection shakedowns, and if you're lucky (as we are in Oklahoma), they'll do away with the emissions testing as well.

  8. #7
    propninja's Avatar
    propninja is offline Cadillac Owners Fanatic
    Automobile(s): CTS
    Join Date
    Jul 2005
    Los Angeles

    Re: O2 sensors

    I've actually done this. The o2 sensors after the cats are easy. the two ahead of the cats are easy to get to if you remove the catalytic converters. The difficult part there is removing the nuts holding because they're going to be rusted on. You don't need to remove the entire exhaust, just the cats. If you do choose to do the job yourself, be sure to replace the nuts with stainless steel, or at least use anti-seize compound on the threads,

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