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Thread: Emission Control System Light Warning

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  1. Question Emission Control System Light Warning 
    #1
    OliSmi Guest
    I have a 53 plate 2.0 TDI A3. The emission control system light has just decided to make an appearance on my way home and I have to be honest im dreading taking it to the garage. Can anyone give me an idea of what the problem is likely to be or what its likely to cost me best and worst case. Also am I safe to carry on driving it until I can get the several billion pouds together it costs every time my car throws a strop!

    If it helps to identify the problem at all I had just filled up
    with fuel when the light came on and i did let it run rather a little below the red line.

    Any help greatly appreciated.
     
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  2. Unhappy  
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    Hi,

    I have exactly the same problem on my 04 plate 2.0TDI - the light came on over the weekend.

    Were you able to get the bottom of it without going to a dealer?

    I'm considering buying the software and cable off ebay, but I'm not experienced so would worry about messing things up !
     
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  3. #3
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    Had the same thing with a 53 plate at one year old while on holiday in Scotland - no dealer near so had to leave it. It went out after 2 days and when I did get to a dealer they found nothing wrong.

    It came on intermittently the next 2 summers but stayed off during the winter. As there was no change in performance, fuel consumption, visible exhaust or engine sound (Advice given by a dealer when the similar light appeared on a petrol engined car. Basically, if there was a problem the ecu would change to 'limp home' mode and you would notice it. If you couldn't notice a difference there was no problem just an electronics glitch that needed a reset done to the computer). With the experience of the previous year I left it and it sailed through the MOT emissions check. I suspect the sensor is sensitive to environmental changes, particularly ambient temperature which would affect voltage.

    If you have any concerns though you should still get it checked out.
     
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  4. #4
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    Thanks for the reply.

    My light has stayed on permanently since it came on, just over three weeks now. There's no noticable change in performance at all - drives the same, sounds the same, exhales the same.

    I did buy the cable & VAGCom, I'll be installing it onto my laptop and checking things out this weekend. I suspect I'll be taking a copy of the report to Awesome GTi an Irlam to see if they can put right whatever is wrong.

     
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  5. #5
    AudiYaLikeIt Guest
    Hi guys, have just got the same problem on my '53 2.0TDI, was wondering how you resolved it?
    Mine is latched on, my local specialist has cleared it (didn't seem to make sense of the fault code) but it has reappeared after two or three starts.
     
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  6. #6
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    Post some fault codes and i will have a butchers
     
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  7. #7
    AudiYaLikeIt Guest
    fault code was (and I quote!) 'P2108 unknown fault mode 7 sporadic errors 475 speed sensor can fault'........should have thought of that myself?!
     
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  8. #8
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    No ive never seen those codes and cant find them.Where they in abs or engine control unit as abs will store a fault if there is a fault in engine management
     
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  9. #9
    AudiYaLikeIt Guest
    I think that it was the engine management that was interrogated.
    I suspect that the fault reader being used by the 'specialist' is not the usual audi equipment. May have to take it to main dealer, but the car's being traded in so was hoping not to spend too much.
    Does the emissions light actually refer to the whole engine management system? Car seems to be running normally, apart from that light?!
     
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  10. #10
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    I suspect the not so specialist was using bosh reader and yes the light is refering to engine management issues but the code may refer to linked systems ie drivetrain can issue.If you manage to get a vw dealer or vag com user to read the code then post it and and we will see
     
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