Throwing codes
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  • 2 Post By dkozloski
Cadillac STS Forum - 2005 through 2012 Discussion, Throwing codes in Past Cadillac Vehicle Discussion; Hello I had a mechanic replace my valve cover gasket on my 2005 STS V8 and now I'm getting a ...
  1. #1
    2bapedup is offline Cadillac Owners Member
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    Throwing codes

    Hello I had a mechanic replace my valve cover gasket on my 2005 STS V8 and now I'm getting a CEL with codes P0174 & p0175 , any suggestions?

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Codes are meaningless without definitions. Off the top of my head, P0174 is a bank 2 lean code. You might want to check the vacuum lines, and any intake ducting AFTER the MAF.

  4. #3
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Re: Throwing codes

    You likely have whatever it is that I have ... Lean bank 1 and bank 2.
    My car sits at the dealer with this issue right now.
    Various things have been tried.
    New MAF, re-torqued intake bolts, replaced intake gaskets, blamed on bad gas, not sure what the reason will be this time.

  5. #4
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Throwing codes

    Check the little hose that connects the PCV valve to the plastic intake elbow.
    Don't mess with Binky Bear!


  6. #5
    1crock is online now Cadillac Owners Member
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    Re: Throwing codes

    Quote Originally Posted by dkozloski View Post
    Check the little hose that connects the PCV valve to the plastic intake elbow.
    Yep, I've been caught by this one myself.

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Interesting. P0175 is a bank 2 RICH code. Can't be lean and rich at the same time. Are you sure you read/typed the codes right? Is it P0171 and P0174?

  8. #7
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Likely typo then. I hope. But mine is lean both banks. Op may have been lean at one time then rich another.

  9. #8
    2bapedup is offline Cadillac Owners Member
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    I'm going to check the hoses again for any cracks

  10. #9
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Throwing codes

    Spray engine starting fluid around the intake manifold and hoses while the engine is runing. If there is a vacuum leak it will become evident. Be careful. It takes a couple of weeks for your hair and eyebrows to grow back out.
    EChas3 and EChas3 like this.
    Don't mess with Binky Bear!


  11. #10
    2bapedup is offline Cadillac Owners Member
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    Talking Re: Throwing codes

    Lol ok thanks

  12. #11
    2bapedup is offline Cadillac Owners Member
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    Re: Throwing codes

    Hey guys I sprayed the engine and no signs of leaks , what do you think about a bad O2 sensor the STS has 95k miles on it ?

  13. #12
    wake's Avatar
    wake is offline Cadillac Owners Enthusiast
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    Re: Throwing codes

    Quote Originally Posted by 2bapedup View Post
    what do you think about a bad O2 sensor the STS has 95k miles on it ?
    That was my next thought. I popped P0174 last night on the way home from work. I did some net searching and there is a TSB out for the Vs that mention possible bad 02 sensor with that code if it's not accompanied by P0171 (Bank 1 Lean) also which would likely be an intake leak after the MAF. The TSB did also list bad gas as a possibility and the possibilities I didn't like which were bad fuel injector or bad ECU.

    I opened up my exhaust though recently with an aftermarket system so I'm wondering if that might be behind it on my vehicle.

    I don't know how O2 sensor have evolved over the years but I do believe they used to be listed as a 100K mile maintenance item. They used to slowly degrade over time and lower fuel economy, replacing them at high miles always gave me back 1 or so mpg that I lost over the years.

  14. #13
    2bapedup is offline Cadillac Owners Member
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    Update I changed the mass air flow sensor & so far so good.... thanks guys

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