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Help loss of power

Discussion in 'A4/S4 forum(B5 Chassis)' started by babyjay, Feb 7, 2010.

  1. babyjay

    babyjay New Member

    Feb 7, 2010
    Likes Received:
    i have a 1.9 tdi a4 b5 and you can drive it fine but in 4th or 5th at about 3000rpm the turbo cuts out and goes in to limp mode but if you turn the ignition off then start it again it will go back to working fine with full boost until it cuts out again. please help with any info iv been told its the maf sensor but how true that is i dont know as there is 2 plugs that go to the maf it looks like someone has spliced into the loom and added another plug.
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  3. B5NUT

    B5NUT Well-Known Member
    VCDS Map User

    Feb 6, 2010
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    Had a simlar broblem with my B7 TDi, this turned out to be the EGR valve. Do you have access to vag-com, as this may give you more information about the fault.
  4. aragorn

    aragorn "Stick a V8 in it!"
    Staff Member Moderator VCDS Map User

    Jan 30, 2008
    Likes Received:
    There is only one plug that goes to the MAF afaik.

    You need to get it scanned with vagcom, which will hopefully give you some insight to the problem, rather than guessing.

    It could be the MAF, or the N75 valve, or even the turbo itself (it could be sticking VGT vanes)

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