05 STS with 4.6. P0174 Lean bank 2 Fixed
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Cadillac STS Forum - 2005 through 2012 Discussion, 05 STS with 4.6. P0174 Lean bank 2 Fixed in Past Cadillac Vehicle Discussion; Just thought I would post this fix incase others are having similar problems. My car has around 90k on it ...
  1. #1
    nwjones18 is offline Cadillac Owners Member
    Automobile(s): 2005 STS
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    05 STS with 4.6. P0174 Lean bank 2 Fixed

    Just thought I would post this fix incase others are having similar problems. My car has around 90k on it and a couple days ago I got a CEL. I went looking for vacuum leaks since that's the easiest thing to cause a lean code. I found that the rubber ends on the vacuum pipe that goes from the passenger side valve cover to the rear of the intake manifold were totally disintegrated. the Pipe is 3/8 and I had some fuel line laying around so I just cut a piece for either end and replaced it. Getting the hose off the back of the intake is a challenge but doable. Hope this helps someone, I have to figure that everyone with the N* will run into this at some point.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    PCV dirty air line connector breaks are common across the Northstar line. If necessary, that entire line can be replaced with a length of proper ID fuel line - fuel line has a reinforcing braid molded in.

    Any of the other preformed plastic vacuum pipes and connectors may be replaced with lengths of proper ID vacuum hose from the Help! racks at parts stores.

    Thanks for the feedback. P 017X codes are usually vacuum leaks - they show up as "lean mixture codes".

  4. #3
    achavez's Avatar
    achavez is offline Cadillac Owners Member
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    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    Thanks for the input. These engine bays run extremely hot. Hotter than my turboed 4cyl awd sedan I had. Thats very harsh on the lines, wires, connectors

  5. #4
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    Lean can also mean loose intake bolts; lkewise mileage appropriate. In my car, it took about 20 ignition cycles for it to clear after I reattached a hose & tightened bolts.

    Today, a month later, passed WI OBD emission test w/o ever having the code reset.

  6. #5
    nwjones18 is offline Cadillac Owners Member
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    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    Quote Originally Posted by EChas3 View Post
    Lean can also mean loose intake bolts; lkewise mileage appropriate. In my car, it took about 20 ignition cycles for it to clear after I reattached a hose & tightened bolts.

    Today, a month later, passed WI OBD emission test w/o ever having the code reset.
    I preemptively tightened the intake bolts when i first got the car. They were all quite loose. I just cleared my codes with a scanner.

    Thanks though!

  7. #6
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    How long ago? Did you torque them?

    I recall one member reported that after the previous owner had overtightened his, they wouldn't hold and I think he ended up replacing the gasket.

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