29E7 Mixture Adaptation 1 Air Leak 29E8 Mixture Adaptation 2 Air Leak
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  1. #1
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    DrNastycoff's Avatar
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    Oct 2016
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    Ireland
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    Car Specs:
    Year
    2006
    Model
    3 Series
    Engine
    320 si
    Fuel
    petrol
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    29E7 Mixture Adaptation 1 Air Leak 29E8 Mixture Adaptation 2 Air Leak

    Hi I have an error code for my 320 SI 2006 it reads: 29E7 Mixture Adaptation 1 Air Leak
    29E8 Mixture Adaptation 2 Air Leak there is also a sound like a lose fan belt but is an air leak .
    Is it just a case of replacing hoses' ?
    many thanks DrNastycoff.

  2. #2
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    RogueXJ's Avatar
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    Nov 2016
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    Mesa, Arizona
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    Car Specs:
    Year
    2008
    Model
    E90
    Engine
    328
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    Petrol
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    It sounds like a PCV system malfunction. A quick test for this is to try and remove the engine oil fill cap whilst the engine is running. If either the cap has a bunch of vacuum holding it on (some vacuum is normal) or the whistling sound goes away when you remove the cap, you have a failed PCV breather valve most likely. On some engines this is integral with the valve cover, but I'm not certain about yours.

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