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FAULT CODE HELP PLEASE

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by 1wheelonly, Nov 16, 2008.

  1. 1wheelonly
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    1wheelonly cabriolet VCDS Map User

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    [Nov 16, 2008]
    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: ooooooooooooooooo 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
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  3. 1wheelonly
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    1wheelonly cabriolet VCDS Map User

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    [Nov 17, 2008]
    anyone?
    #2
  4. evilscotsman
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    evilscotsman Space Cowboy

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    [Nov 17, 2008]
    looks like your cat may be knackered obviously mate, if it was the o2 or lambda sensor it would mention that instead.

    And if I was you I would edit that post above to blank out your VIN number!!!! Thats begging to be used on a ringer by someone! After all, from your pic and that post they have your make, model, reg and VIN....
    #3
  5. J7USS
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    J7USS Shuddup Foooool!!

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    [Nov 17, 2008]
    Too late, ive already bought his car!;)
    #4
  6. 1wheelonly
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    1wheelonly cabriolet VCDS Map User

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    [Nov 17, 2008]
    evil
    its been coming on for a while now, but it has just had an mot and passed, if the cat was gone wouldnt it of failed.

    j7uss
    on the ringer you just bought, is the cat any good and do you want to sell it? LOL
    #5
  7. J7USS
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    J7USS Shuddup Foooool!!

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    [Nov 17, 2008]
    Haha! Nice one 1wheel, Ill have a look:)..

    If it passed MOT then like you say the cat should be OK.
    #6
  8. VRStu
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    VRStu Just Looking VCDS Map User

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    [Nov 17, 2008]
    It's not a huge issue, the VIN is visible to anyone passing the car in the street as is the reg number.
    #7
  9. 1wheelonly
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    1wheelonly cabriolet VCDS Map User

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    [Nov 17, 2008]
    not long had a new oem system, but only from the cat back
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  10. evilscotsman
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    evilscotsman Space Cowboy

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    [Nov 18, 2008]
    I wonder if the ecu's idea of a cat thats working poorly is still enough to pass an emissions sniffer test.....might not pass next time or even a months time - you never know.

    Just a thought as I reckon the dtc would have mentioned the o2 sensor or something like that, not "catalyst system efficiency below threshold" - which reads to me like "the cat doesnt seem to be working well enough" so thats why I think its that.
    #9

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