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n249 location asap

Discussion in 'A3/S3/Sportback (8P Chassis)' started by leonski, Sep 10, 2011.

  1. leonski
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    leonski New Member

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    2005 A3 2.0 T fsi quattro
    symptoms - emissions light , turbo chatter noise.
    vagcom - N249 mechanical malfunction

    As above, can anyone tell me where the N249 is? also, any other ideas as to what could be wrong?

    Thanks
    #1
  2. Lewis583
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    Lewis583 Active Member

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    [​IMG]


    Number 23 on there mate.
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  3. Leon tfsi
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    Leon tfsi Member

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    Cheers mate, so it's attached to the turbo. Does that mean I access it from underneath then?
    Would this cause the chatter noise also? Thanks
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  4. audicruiser
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    audicruiser Audi Heaven

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    Yes, it's normally referred to as the Diverter Valve. You will have a rubber Rev C on your car I expect which will have split. Audi released the Rev D type which is a piston and don't fail. They are around £50 and take 20 mins to change.... Your car will then have it's full boost back and no noise....

    You do get to it from underneath.
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  5. Leon tfsi
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    Leon tfsi Member

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    So that's a diverter valve. An old receipt from previous owner is for a forge diverter valve? Does this change anything?
    #5
  6. audicruiser
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    audicruiser Audi Heaven

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    Depends if he left it on the car... A receipt is one thing... A forge DV on the car is another!!
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  7. Leon tfsi
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    Leon tfsi Member

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    Is there any way of knowing without looking? There is a strange thin black pipe coming off a junction near the evap sensor then ziptied along the front of the engine from right to left and then goes off down to the left of the engine somewhere? It's obviously not standard so I assumed it must be something to do with the forge dv on the receipt? Any ideas?
    #7
  8. audicruiser
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    audicruiser Audi Heaven

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    Not really, you will have to see it to know which is fitted.
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