P0171 & P0174 codes on E350 CGI

Discussion in 'Engine' started by x332race, Mar 25, 2017.

  1. x332race

    x332race Hardcore MB Enthusiast

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    Does anyone have any model specific pointers as to what to look for on a 2010 E350 petrol throwing P0171 & P0174 codes? I am assuming an air leak is the most obvious fault?

    I can see nothing obvious but it is difficult to look at the back of the engine.
     
  2. OP
    OP
    x332race

    x332race Hardcore MB Enthusiast

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    Solved. It was the O ring on dipstick.
     
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  3. OP
    OP
    x332race

    x332race Hardcore MB Enthusiast

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    Update:- dipstick was not the only problem. Following on I was still getting occasional P0171 /P0174 codes. After full diagnosis found that there was a hole in the pipe serving the purge valve which was only obvious when purge valve was open.
     
  4. Tuercas viejas

    Tuercas viejas Hardcore MB Enthusiast

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    This is were a smoke machine comes in useful when trying to trace such leaks, such as secondary evaps faults.
    Nowadays an essential professional shop addition to have at hand .
    Tuercas Viejas
     

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