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Audi A6 C6/4F V6 TDI Fuel Filter Change Guide

a6_chris Aug 3, 2014

  1. a6_chris

    a6_chris Registered User

    This was done on a V6 ASB engine, may differ for 4 cylinder diesels and petrol models.

    Parts needed

    Fuel Filter - 4F0-127-435-A
    Flathead screwdriver
    VCDS (easiest way of refilling the filter)
    Some spare diesel (if you don't have VCDS)

    Start by removing your engine cover

    Now unclip each clip shown in the picture, the blue arrow points at the metal clip which pulls out (not shown as I had this removed)

    I advise wearing gloves as there will be some diesel spillage


    Pic of pipes removed, I also removed the ducting between the MAF and engine for more access, this is held on with 2 jubilee clips


    Pull the black circle fitting off the filter, also remove the 10mm bolt from the black cylinder also shown in the pic


    New filter


    Old filter removed



    Make sure everything is on tight and the black circle fitting is pushed down tight into the filter

    Start Up

    Easiest way of doing this is through VCDS, go into Engine - Output Tests and look for the below, let this run for 30-45secs. Engine should fire. If not, prime it again


    For reference, I tried to start the car with the empty filter, this is what (didn't!) happen. The car eventually will start if doing it this way although it will be sore on your starter motor and battery so I recommend either filling the new filter with diesel manually or doing the VCDS output test.

    You will also get a EML and engine fault code if you try to start it.

    Address 01: Engine       Labels: Redir Fail!
    Control Module Part Number: 4F9 910 401     HW: 4F0 907 401 C
      Component and/or Version: 3.0L V6TDI  G000AG  0020
               Software Coding: 0011372
                Work Shop Code: WSC 02334 785 00200
                          VCID: E2CF52463D8F1D0E6D3-80B7
    1 Faults Found:
    004195 - Fuel Pressure Regulation 
                   P1063 - 010 - Control Range Not Reached - MIL ON
                 Freeze Frame:
                        Fault Status: 11111010
                        Fault Priority: 0
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 172355 km
                        Time Indication: 0
                        Date: 2014.08.03
                        Time: 19:46:29
                 Freeze Frame:
                        RPM: 840 /min
                        Torque: 117.0 Nm
                        (no units): 17.0
                        Voltage: 13.45 V
                        Pressure: 92.3 bar
                        Duty Cycle: 31.6 %
    Readiness: 0 0 0 0 0 
    Easy!! :)
    Last edited by a moderator: Aug 15, 2014
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  3. B5NUT

    B5NUT Well-Known Member VCDS Map User

    Audi techs just keep starting the engine until it fires up! Have to say I've not had the fault code EML light on after changing the filter, I've only done it a couple of time on the A6, and it due next month so will keep eye out on the fault codes.
    RoyC likes this.
  4. a6_chris

    a6_chris Registered User

    I wasn't expecting a fault but checked out of curiosity. VCDS is the easiest way of getting the car going again.
    RoyC likes this.
  5. MarkWizard

    MarkWizard Active Member VCDS Map User

    Filling the fuel filter with injector cleaner also works and gives them a nice meaty blast of cleaner
    RoyC likes this.
  6. gupsterg

    gupsterg Registered User

    Great guide Chris :) .

    I filled my fuel filter before fitting new, IIRC I also slacked the bleed nut on fuel filter when running VCDS just to aid any air to be pushed out.
    RoyC likes this.
  7. joedredd

    joedredd 2009 S4 just love it VCDS Map User

    Bumping an old post as just done this for the first time, and the instructions are spot on. The wife's happy as well as save a few ££££!!
    How often should you replace the filter?
  8. spottedhaggis

    spottedhaggis Registered User

    Id like to do this to mine, but the images for these instructions don't seem to be there any more?

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