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DPF light on dash!!! Arrrggghh

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by scotty2hotty, Apr 20, 2012.

  1. scotty2hotty
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    scotty2hotty Member

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    Ive got an 07 a4 2.0TDI and I've done approx 50 miles in it since I've had it and now the DPF light has come on so I took it down the motorway in 5th gear at between 2k and 2.5k, I've done about 40 miles and the bloody light is still on ( not impressed )
    Any advice??????
    #1
  2. eddscott
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    eddscott Member

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    Invest in having it removed and the car mapped?

    Have it taken out and cleaned and refitted?

    Have a shiny new one fitted?

    Think thats about the total of your options. I went with door No1.


    Oh, I also think it needs a good booting to try and clear it rather than a constant RPM but that could be wrong.
    #2
  3. scotty2hotty
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    scotty2hotty Member

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    A friend of mine is an auto electrician and has vagcom he said he can plug it in and force the DPF to regenerate itself so im going to try that tomorrow.
    How much is it to have the DPF mapped out and can you just take the DPF off and smash out the insides??
    #3
  4. chrisa4quat
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    chrisa4quat Member

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    Yeah vcds should do it. Unless the sensor is faulty!
    #4
  5. scotty2hotty
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    scotty2hotty Member

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    id like to think its not a sensor fault (or any fault thats going to cost any money for that matter lol) as the car has done less than 37k but i suppose the mileage means nothing these days
    #5
  6. jaygeezer871
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    jaygeezer871 Member

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    #6
  7. scotty2hotty
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    scotty2hotty Member

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    that reminds me we have some forte DPF cleaner stuff at work which is meant to be really good stuff may give that a go if the regeneration through vagcom doesnt work.
    #7
  8. outsideline
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    outsideline Member

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    get it removed!!! best thing i have ever done getting rid of mine. i also got rid of the egr as well, car drives way smoother now and with the remap pulls like a train.
    if your willing to travel try rick @ unicorn motorsport, hes done all my work and really is a clued up bloke, not some one just putting generic map on your motor.
    #8
  9. murran
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    murran Active Member

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    replace the g450 dpf pressure sensor. try the regen again.
    "I took it down the motorway in 5th gear at between 2k and 2.5k" this is correct way to do the regen.

    the g450 sensor is around £50 new.
    #9
  10. *Adam
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    *Adam Member

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    Check blocks 70 and 75 on the engine controller in VCDS/VAG-COM and post us the results.
    #10
  11. Macdoon
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    Macdoon Well-Known Member

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    Have you got a link for Unicorn motorsport.

    Mac
    #11
  12. RMH1A4cab
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    RMH1A4cab I'm in Cruise control

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    #12
  13. scotty2hotty
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    scotty2hotty Member

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    How much was your DPF delete pipe?
    #13
  14. scotty2hotty
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    scotty2hotty Member

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    Block 70 status 4 regeneration =000000000
    regen time (total) 2999.8 s
    failed regenerations 1.0
    successful regenerations 0
    Block 75 :-
    temp before turbo 164.3 deg c
    temp before partic filter 150.0 deg c
    partic filter load 29.5%
    temp after part filter 159.5 deg c
    are these readings correct????
    also the temperature before turbo fluctuates by about 40 degrees just by reving it is this right???
    #14
  15. murran
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    murran Active Member

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    ash loading 29.5%. its not over loaded, should be able to regenerate it.

    temp readings look correct for an idling engine.
    when the regen is happening when being driven the particulate filter temps go up to as much as 650 degreesc to burn the soot off in a clean manner.

    even if you have no fault codes relating to the g450. replace it anyway.
    #15
  16. *Adam
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    *Adam Member

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    Your filter load isn't what I would call bad. The sensors look like they are working as they should and yes it should fluctuate when revving.

    I would do a force regen just to try and get the load down a tad. the reason you have the light is the failed regen as it took too much time.

    Just for future reference in case someone else needs to do a regen here are the steps.

    Prerequisites (General):

    • Ignition ON
    • Engine ON (Idle)
    • Coolant Temperature above 50 °C (see MVB 002.4)
    • Particle Filter Load below Specification (see MVB 075.3, VAG-COM should give the specified value)
      • If the Particle Filter Load is above Specification the Particle Filter needs to be replaced since the car may burn down when regenerating.
    • Power Consumers ON (Light, Seat Heating, Front/Rear Window Heater, Climate Control)
    Conditions (Driving Cycle):

    • Vehicle Speed between 30-60 km/h (18-37 MPH)
    • Engine Speed between 1500-2500 RPM (4th or 5th Gear, Automatic Transmission in Tiptronic)
    • Duration approx. 15-20 Minutes
    • Exhaust Gas Temperature before Turbo Charger above 700 °C
    Drive the car based on the above conditions until the Particle Filter Load is as low as possible (close to 0 %). In case the regeneration fails there can either be problems with the Driving Cycle Conditions or with the Engine Hardware.
    [Select]
    [01 - Engine]

    [Coding-II - 11]

    • Enable Regeneration by Entering 21295.
    • [Do It!]
    (when you enter this you'll see EGT before turbo jump up to around 750degC!)
    [Meas. Blocks - 08]
    Select both Groups at once 070 and 075.
    [Go!]
    MVB 070.1: Regeneration Status (xxxxxxx1 = Normal Regeneration active, xxxxxx1x = Forced Regeneration active)
    MVB 070.3: Regeneration Counter/Timer
    MVB 075.1: Exhaust Gas Temperature before Turbo Charger
    MVB 075.2: Exhaust Gas Temperature before Particle Filter
    MVB 075.3: Particle Filter Load
    MVB 075.4: Exhaust Gas Temperature after Particle Filter

    Now Start the Driving Cycle and keep watching the Measuring Blocks (2nd Person required).
    (You should see DPF load start to reduce from 20% down to 0% pretty quickly. If at any point EGT before turbo drops back down to a lot less than 700degC re-enter the login code and start the procedure again)

    [Done, Go Back]
    [Close Controller, Go Back - 06]
    #16
  17. murran
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    murran Active Member

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    betwwen 0 and 10% is good/normal i think above 40% and the diagnostics wont let you do a forced regen. risk of fire!

    if its only at 29.5 and its not regenerating itself in normal use.

    g450...........
    #17
  18. scotty2hotty
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    scotty2hotty Member

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    I did a forced regen on it yesterday I borrowed my mates vagcom and thankfully the percentage dropped quite quickly and I got it down to 0% :)
    im still thinking about deleting the DPF does anyone know how much a delete pipe will cost??
    #18
  19. outsideline
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    outsideline Member

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    dpf delete, egr delet and remap all in the same job from unicorn is £500, best money you will spend on that car!!

    hes in singapore though this week if your trying to get hold of him.
    #19
  20. Macdoon
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    Macdoon Well-Known Member

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    #20
  21. outsideline
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    outsideline Member

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    website isnt fully active yet, you have to ring him. numbers in my siggy.
    #21
  22. Macdoon
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    Macdoon Well-Known Member

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    Cheers fella
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  23. murran
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    murran Active Member

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    that good then!
    #23
  24. scotty2hotty
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    scotty2hotty Member

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    yeah i think so lol

    They seem more hassle than there worth these dpf's.
    #24
  25. *Adam
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    *Adam Member

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    Honestly one of the best things I have done getting rid of the DPF. No more worry over the fill levels.
    #25
  26. Rick @ Unicorn Motor Dev.
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    Rick @ Unicorn Motor Dev. Site Sponsor Site Sponsor

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    DPF removal is worth it just for the whistle :)

    Rick
    #26
  27. murran
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    murran Active Member

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    ^^^^^ understatement of the year?
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