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A4 immobiliser problem

Discussion in 'A4/S4 forum(B5 Chassis)' started by Deanh, Oct 21, 2012.

  1. Deanh
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    Deanh New Member

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    [Oct 21, 2012]
    Been having problems with my immobiliser,


    battery died a few months ago and as it was dying the immobiliser would kick in after 2 seconds of starting which I put down to the weak battery,


    put a new battery on but had the same problem since, meaning to start the car I have to disconnect the battery for 20 seconds and as soon as I switch it off I have to do the same thing again to restart it,


    Its been to the garage twice and put on vag com and 50/504a and on vag com it says the key signal is too weak, the instrument panel is clear of faults, and on the 50/50 software says the ecu is in static mode and won't talk to the immobiliser!!!!


    anyone any ideas?




    i have tried a more powerful battery but that still has the problem so I know it's not a battery fault and my key has no battery in it
    #1
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Oct 22, 2012]
    I think the battery is a red herring.

    The normal immo activation is to shut the engine down after a second or two, so what you describe there isnt anything battery related.

    Have you tried another key?

    Might need a new reader coil, or sometimes the wiring to the coil causes issues.
    #2
  4. hades-
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    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Oct 22, 2012]
    as above iv sorted quite a few B5's with immob problems
    changed the wire from reader and all was good
    easy ish job to do and parts not a lot of £££.
    #3
  5. jcb
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    jcb Active Member VCDS Map User

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    [Oct 22, 2012]
    where is the reader and how do you remove/replace/repair the wiring?
    #4
  6. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Oct 23, 2012]
    Its part of the ignition barrel.

    Not sure if you can swap the reader on its own, or if you need to buy a whole new barrel though.

    The wiring on earlier cars can prove problematic though!
    #5

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