1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

EGR fault and DPF blocked

basssound Dec 17, 2011

  1. basssound

    basssound Member

    203
    10
    16
    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?
     
  2. mike foster

    mike foster Fossie VCDS Map User

    3,967
    83
    48
    You're sure you have a dpf ? Presumably you have a 170 ?
     
  3. basssound

    basssound Member

    203
    10
    16
    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 ;)
     
  4. mike foster

    mike foster Fossie VCDS Map User

    3,967
    83
    48
    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
     
  5. basssound

    basssound Member

    203
    10
    16
    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.
     
  6. basssound

    basssound Member

    203
    10
    16
    Anyone got the Audi instructions for checking the EGR feed, earth and reference signals?
     
  7. basssound

    basssound Member

    203
    10
    16
    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 :(
     
    Stampie likes this.
  8. basssound

    basssound Member

    203
    10
    16
    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]
     
  9. Sidhu88

    Sidhu88 Active Member

    808
    76
    28
    not thread hijacking but i have a weird problem with the dpf not regenerating, whereabouts are u based?
     

Share This Page