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Naughty A8 - Cyclic revs at low speed, interesting but misleading codes!

A8Shep May 17, 2013

  1. A8Shep

    A8Shep New Member

    Hello everyone

    I have an 02 D2 2.8 A8 which I would like to start enjoying at some point but there are a couple of things still bothering me with it.

    I have had the autobox fully serviced and while it was open had the solenoid valves cleaned as well. Bank 3 had shown as faulty so that was replaced with a delightfully expensive substitute.

    Needed a new battery as well so that's sorted.

    I also have a Ross-tech VCDS which I used to carry out a throttle body alignment following battery replacement.

    NOW - when I travel at a speed that has the revs between 1000 and 1800, it cycles up and down the revs by about 50 each way and it's really irritating; at speed, no problem at all, nor in reverse. I have noticed lately that it hard shifts to 1st when stopping as well.

    When I scanned for codes, I got an ABS warning referring to communication to the gearbox was intermittent. I have posted the read out below. I have read in certain places that cleaning the ABS sensors can sort this but could this really be causing my cyclic revs thing? I have also heard of a switch under the gear selector that sometimes goes on the blink.

    Trans codes non-existent so can't diagnose any further alone; apart from an O2 sensor issue, engine codes are clear as well.

    Anyone suffered this torment? Don't want to give it up so any help is appreciated.

    Thanks in advance

    Chassis Type: 4D - Audi A8 D2
    Scan: 01 03 08 11 15 16 17 18 25 35 37 45 55 56 57 65 67 75 76 77

    VIN: WAUZZZ4D43N001333
    Address 01: Engine Labels: Redir Fail!
    Part No: 3B0 907 551 BT
    Component: 2.8L V6/5V G 0001
    Coding: 11753
    Shop #: WSC 02314
    VCID: 76E7E2EB7857
    WAUZZZ4D43N001333 AUZ7Z0A2020208

    4 Faults Found:
    16804 - Catalyst System; Bank 1: Efficiency Below Threshold
    P0420 - 35-00 - -
    16814 - Catalyst System; Bank 2: Efficiency Below Threshold
    P0430 - 35-10 - - - Intermittent
    16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
    P0130 - 35-10 - - - Intermittent
    16534 - Oxygen (Lambda) Sensor B2 S1: Malfunction in Circuit
    P0150 - 35-10 - - - Intermittent
    Readiness: 0000 0000

    Address 03: ABS Brakes Labels: 8D0-907-389.lbl
    Part No: 4D0 907 389 E
    Component: ABS/ESP allrad D57
    Coding: 08397
    Shop #: WSC 02313
    VCID: 316D11F7D1B9

    1 Fault Found:
    01119 - Gear Recognition Signal
    35-10 - - - Intermittent

    Address 08: Auto HVAC Labels: 4D0-820-043-MYX.lbl
    Part No: 4D0 820 043 P
    Component: A8-Klimavollautomat D13
    Coding: 00061
    Shop #: WSC 02314
    VCID: 295DF997F969

    No fault code found.

    Address 02: Auto Trans Labels: 01V-927-156.lbl
    Part No: 4D0 927 156 DR
    Component: AG5 01V 2.8l5V RdW 1818
    Coding: 00001
    Shop #: WSC 02314
    VCID: 7CF3F0C3467B

    No fault code found.

    End ---------------------------------------------------------------------
  2. A8Shep

    A8Shep New Member

    Also perhaps worthy of note is the fact that, whilst the wheels were being balanced, I noticed that the CV boots look past their best. Not sure if a dry CV would cause the issue but I suppose it's worth mentioning everything

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