code P0430, is it the O2 sensor?

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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, code P0430, is it the O2 sensor? in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Hello, I recently had a check engine on go on today, I had it scanned and the code read a ...
  1. #1
    tito082 is offline Cadillac Owners Member
    Automobile(s): 2004 CTS 3.6 L
    Join Date
    Jul 2013
    Los Angeles, CA

    code P0430, is it the O2 sensor?


    I recently had a check engine on go on today, I had it scanned and the code read a P0430, " catalyst efficiency below threshold bank 2". Should I change the O2 sensors? and if so, does anyone have a diagram or a "how-to" pictoral? Any suggestions would help.

    Thank you

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  3. #2
    CTSUK's Avatar
    CTSUK is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 Cadillac CTS 3.6 Sport Luxury
    Join Date
    May 2012
    United Kingdom

    Re: code P0430, is it the O2 sensor?

    I think its more likely to be the cat going bad than the 02 sensor, you could replace bank 2s sensors before shelling out I guess.

    similar car similar issue:
    he had to have both cats replaced.

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