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EGR fault and DPF blocked

Discussion in 'A3/S3/Sportback (8P Chassis)' started by basssound, Dec 17, 2011.

  1. basssound
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    basssound Member

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    [Dec 17, 2011]
    Well last night the EML come on and then this morning the DPF warning came on.
    I used a scanner and checked the fault codes, there's only one fault.

    P0404 - Exhaust Gas Recirculation circuit range/performance

    Now obviously because of this EGR fault the DPF won't regenerate :/

    Anyone got any information or help, i'm reluctant to spend £200 for the EGR valve if it turns out the blocked DPF could be the cause?
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  3. mike foster
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    mike foster Fossie VCDS Map User

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    [Dec 17, 2011]
    You're sure you have a dpf ? Presumably you have a 170 ?
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  4. basssound
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    basssound Member

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    [Dec 17, 2011]
    Yeah it's a 2.0 TDI 170
    Engine code is BMN, i'm a diesel mechanic for merc benz but I do know that a blocked DPF can cause EGR issues and vice versa ;)
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  5. mike foster
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    mike foster Fossie VCDS Map User

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    [Dec 17, 2011]
    If you're a merc mechanic then you will know that VCDS is the usual diagnostic tool for VAG faults. Ross-Tech fault categories do not recognise that code but this may be helpful :- 16787/P0403/001027 - Ross-Tech Wiki
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  6. basssound
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    basssound Member

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    [Dec 17, 2011]
    The P0404 is a recognised code for diesel engines with electronic EGR valves, I must admit I did use a MAC tools scanner
    but i'll have access to VCDS on Monday. I keep meaning to buy VCDS but I never seem to get round to doing it.
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  7. basssound
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    basssound Member

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    [Dec 18, 2011]
    Anyone got the Audi instructions for checking the EGR feed, earth and reference signals?
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  8. basssound
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    basssound Member

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    [Dec 18, 2011]
    I have removed the EGR valve and stripped it down to find the actual trumpet has snapped off the adjuster fork.
    A picture in a bit will show what I mean but this does mean I need a new EGR valve :(
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  9. basssound
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    basssound Member

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    [Dec 18, 2011]
    Here is a picture of the mechanism inside the black plastic housing, as you can see the 'T' bar has snapped off, the round disc is the top hat.
    I have removed the disc and welded the 'T' bar back onto the trumpet which controls the amount of exhaust gas allowed through.

    [​IMG]
    #8
  10. Sidhu88
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    Sidhu88 Active Member

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    [Feb 20, 2012]
    not thread hijacking but i have a weird problem with the dpf not regenerating, whereabouts are u based?
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