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Thread: EGR fault and DPF blocked

  1. #1
    1st Gear

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    EGR fault and DPF blocked

    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. #2
    Fossie

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    You're sure you have a dpf ? Presumably you have a 170 ?

  4. #3
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    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

  5. #4
    Fossie

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    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

  6. #5
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    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.

  7. #6
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    Anyone got the Audi instructions for checking the EGR feed, earth and reference signals?

  8. #7
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    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.

  9. #8
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    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.


  10. #9
    4th Gear

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

 

 

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