2006 Cadillac CTS with P0303

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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 2006 Cadillac CTS with P0303 in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; First time on this forum and need advise. My CTS just crossed 100,000 miles and whammo...car starts sputtering and engine ...
  1. #1
    bradlm5 is offline Cadillac Owners Member
    Automobile(s): 2006 Cadillac CTS
    Join Date
    Jun 2012

    2006 Cadillac CTS with P0303

    First time on this forum and need advise. My CTS just crossed 100,000 miles and whammo...car starts sputtering and engine light comes one. I use a meter to get the P0303 error and probably need to replace all the spark plugs anyway, so that I will. Can someone confirm that if 1-3-5 are on the passenger side and 2-4-6 are on the driver side. Also, are 1 and 2 at the front of the engine or the rear??? Also again, how difficult is it to remove the upper intake to get to cylinder 3 spark plug??
    Thankx all!!!!!!

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  3. #2
    Kingoftypos is online now Cadillac Owners Master
    Automobile(s): 06 CTS Sport/Luxury package
    Join Date
    Apr 2009
    Ledyard, CT
    There is a how to in the DIY section that explains all this with pictures.


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