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2.0TDI Exhaust Sensor/Flap failure?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by benw123, Sep 9, 2009.

  1. benw123
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    benw123 Moderator

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    [Sep 9, 2009]
    Hi guys,

    The yellow engine warning light flicked on in our 2004 Sportback 2.0TDI recently and while there were no obvious problems, I took it in to Hatfield Audi this morning to ask them to diagnose it, which they did free of charge while I waited.

    Unfortunately, I didn't get the full details of the fault because I was expecting to take a copy of the work schedule away with me, and wasn't allowed, but the chap explained that an exhaust sensor or module had failed (he mentioned something about a flap!). I'm sure this isn't an airflow sensor, but the bill would be a whopping £454 - the part alone was a fraction over £245. It takes an hour to fit apparently but I didn't book it in there and then.

    Does anyone have any idea exactly what this is? As I'm well out of warranty now I'm keen to understand what this might be before getting the dealer to fix it.

    Any thoughts/comments welcomed.
    #1
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  3. Boydie
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    Boydie Boycie VCDS Map User

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    [Sep 9, 2009]
    Have you access to vagcom or know anyone with it? Fault V157 if my memory serves me correctly!

    Sounds like the old throttle body which costs around that from audi and around £175 from Eurocarparts

    Is your ECON light staying on permanently?

    Check fuses 8 or 10 to see if they are blown.
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  4. benw123
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    benw123 Moderator

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    [Sep 9, 2009]
    Hi Boydie, thanks for the quick response. I don't have VAG-COM unfortunately, but the service guy didn't mention anything about a throttle body - this sounds much different! Good place to start though. The ECON light seems fine but I'll double-check the fuses later on.
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  5. tates1979
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    tates1979 Member

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    [Sep 9, 2009]
    Sounds like the intake manifold flap and its associated motor, same as mine. This is attached to the EGR (Exhaust Gas Recirculation).

    As previous poster said, check your fuses (under the bonnet), if it sticks the f8 blows.

    Have a read of this thread, seems not SO difficult for a DIY job

    http://www.audi-sport.net/vb/showthread.php?t=58985

    T
    Last edited: Sep 9, 2009
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  6. Boydie
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    Boydie Boycie VCDS Map User

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    [Sep 9, 2009]
    Its a piss easy job to fix and shouldn't take an hour anyway!

    You can have a go at removing it and cleaning it to see if its just clogged up but I would just recommend getting one from Eurocarparts for £70 less than what audi charge
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  7. benw123
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    benw123 Moderator

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    [Sep 9, 2009]
    Nice one - that sounds more like the problem that was described. Will have a look. Thanks for the responses!
    #6
  8. benw123
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    benw123 Moderator

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    [Sep 9, 2009]
    Just been out to check the fuse and F8 is still intact. However, the thread link above is perfectly detailed so it's time to roll up the sleeves!
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  9. makavelli
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    makavelli New Member

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    [Sep 9, 2009]
    yep sounds like the throttle body

    i had the same problem, eurocarparts were great i ordered the part and got it the next day :D

    its a common design fault and the newer throttle bodies have been made to overcome this

    i beleive the teeth wear on the old ones as they are plastic but the newer ones are metal

    i am a complete audi noob and it only took me half an hour to swap the throttle bodies over :D

    was 175 for the throttle body and is very easy to change over

    andy
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  10. benw123
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    benw123 Moderator

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    [Sep 11, 2009]
    Music to my ears (or eyes, since I'm reading it!). I've got a fair bit of DIY car mechanics experience so hopefully a swap really will be as straightforward as everyone says. Will clean out the EGR too if I can.

    Cheers for the post!
    #9
  11. vinnyl
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    vinnyl New Member

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    [Oct 22, 2009]
    my prob sounds very similar to his and could do with some advice on on it here goes
    Hi all i have an a4 turbo diesel 2004 and i ran it low on diesel last week and now when driving sometime s it happens its like the engine shuts down or loses power kinda shudder s revs drop if i accelarate hard a puff of black smoke out the exhaust and away it goes perfect sometimes this can happen every min for a bit other times like on a motorway it never happens so first i think i did was added injector cleaner to the diesel still no good so took to local garage today changed fuel filter and checked for errors it gave me p3105 intermittent and p 19561
    The code 19561 - Valve for Intake Manifold Flap (N239): Open or Short to Ground
    The code P3105 - Intermittent

    so any suggestions what to do next all help appreciated
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  12. Boydie
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    Boydie Boycie VCDS Map User

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    [Oct 22, 2009]
    valve for intake manifold flap suggests the throttle body - £175 from eurocarparts :)
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  13. vinnyl
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    vinnyl New Member

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    [Oct 22, 2009]
    but when it says open or short to ground does this indicate a short or that it needs new part
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  14. Boydie
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    Boydie Boycie VCDS Map User

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    [Oct 22, 2009]
    Mine said the same thing but since it was intermittant, I replaced the unit anyway. It was also connected to my climate control and fuse number 8. once i replaced the throttle body, all problems went away!
    #13

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