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FAULT CODE HELP PLEASE

Discussion in 'A3/S3/Sportback (8P Chassis)' started by 1wheelonly, Nov 17, 2008.

  1. 1wheelonly
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    1wheelonly cabriolet

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    not getting any response from the a4 clan so i thought id ask the a3 lot as theres bloody hundreds of you.

    My ecu light keeps coming on, reset it a couple of times but it comes back so must have a fault.
    here is the fault from my scan, could anyone tell me what it means and what part i need to cure it,also whats involved to fit it.cheers

    Address 01: Engine Labels: None
    Part No SW: 8E0 909 518 AL HW: 8E0 909 018 A
    VIN: 000000000000000 Mileage: 98780km/61379miles
    Component: 1.8L R4/5VT 0003
    Coding: 0011504
    Shop #: WSC 00672
    1 Fault Found:
    16804 - Catalyst System; Bank 1: Efficiency Below Threshold
    P0420 - 002 - Lower Limit Exceeded - Intermittent - MIL ON
    Readiness: 0000 0000
    #1
  2. VRStu
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    VRStu Just Looking

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    http://wiki.ross-tech.com/index.php/16804/P0420/001056

    #2
  3. 1wheelonly
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    1wheelonly cabriolet

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    sh*t looks costly!
    #3
  4. VRStu
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    VRStu Just Looking

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    Are you on an OEM exhaust and if so is it leak free?

    If yes then I would suggest 02 sensor changed first.
    #4
  5. 1wheelonly
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    1wheelonly cabriolet

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    stu
    just had a suggestion that the cat might be buggered but just passed mot, thought they took readings.
    not long had new exhaust system OEM but only from cat back, would it need to be leeking before the cat.
    #5
  6. VRStu
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    VRStu Just Looking

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    I think a leak anywhere from the manifold to the 02 sensor will cause an issue.

    There are some tests that can be carried out with VAS/VCDS to test the 02 sensors etc so it might be worth an hours labour if you can't do it yourself.
    #6
  7. 1wheelonly
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    1wheelonly cabriolet

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    ive got vagcom
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  8. VRStu
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    VRStu Just Looking

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    Ahh but do you know what tests to do :think:
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  9. 1wheelonly
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    1wheelonly cabriolet

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    do i bo**ox.
    kinda hoping you did though lol
    #9
  10. VRStu
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    VRStu Just Looking

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    I'm afraid I don't have a great deal of 1.8T info.
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  11. VRStu
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    VRStu Just Looking

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    Actually I lie, I have just checked and I have the tests for the 1.8t AUQ.
    #11
  12. 1wheelonly
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    1wheelonly cabriolet

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    whats auq mate
    #12
  13. VRStu
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    VRStu Just Looking

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    It's a variant of the 1.8t.

    I would think the tests would be ok for yours.

    PM me an email address and I'll send it over.
    #13

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