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p0171

  1. 2005 STS 4.6L P0174 - phantom vacuum leak

    Cadillac STS Forum 2005 through 2012
    The white whale I have been chasing for a few years. My LH2 (~65k miles) has high LTFT (over 20%) on both banks during high engine vacuum, though bank 2 is higher and thus occasionally (maybe every four months) sets a P0174 after extended driving. At cruise or acceleration, LTFT are above 0% and...
  2. Changing Spark Plugs

    Cadillac DTS Forum 2006 through 2011
    In the next two to three weeks, I will be changing the gasket of the cam cover in the rear of the engine, and at the same time will be replacing the spark plugs, since it is a bit of a pain to take off. I am thinking of using iridium instead of platinum, as they have a higher melting point, and...
  3. P0171 P0299 and P288C Codes on 2013 ATS 2.0T

    Cadillac ATS General Discussion Forum
    Hello, two weeks ago I had two codes P0171 and p0299 and they eventually went away. Last night I was driving on the high way when suddenly check engine light, service stabilitrak, and service traction control lights all came on. Also got an alert that said engine power reduced and speed limited...
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