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Epc light

Discussion in 'A3/S3 Forum (8L Chassis)' started by jay22s3, Nov 6, 2013.

  1. jay22s3
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    jay22s3 2nd gear sorts em out

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    [Nov 6, 2013]
    Today I fitted a tuned n75 valve sensor which I bought from a German company I took it for a spin and it seemed to have sorted my problem out but tonight taking my son to a class I was driving along it was just about to boost and then blurrrr and the epc light came on the dash and the car just wouldn't go . I pulled over and turned the car off took the key out and then restarted it and everything was fine but in the owners book it say if this light displays take it to the audi shop without delay ! It seems fine now but should I be worried help please
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Nov 6, 2013]
    A 'tuned' N75 valve huh... there is no such thing :)

    EPC light coming on like that is most likely the MAF... scan for fault codes...

    Would also help if we knew the year/model/engine code of the car..

    <tuffty/>
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  4. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Nov 6, 2013]
    Ahh. Same seller does blinker oil. . MAF More likely. But a code scan will tell all
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  5. jay22s3
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    jay22s3 2nd gear sorts em out

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    [Nov 6, 2013]
    I'm only going of the listing on eBay that I bought the n75 from they listed it as a tuned one , my car is a 1999 s3
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  6. jay22s3
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    jay22s3 2nd gear sorts em out

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    [Nov 6, 2013]
    I've never really noticed the epc light before when I turn the ignition on but it doesn't stay on is this normal for it to display when you turn the ignition on ?
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  7. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Nov 6, 2013]
    EPC light will come on with ignition and go out when engine is running...

    As said, scan for fault codes... these cars have so many different fault codes they can use its clutching at straws until at least the scan is done..

    Is the N75 brown by any chance?

    <tuffty/>
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  8. jay22s3
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    jay22s3 2nd gear sorts em out

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    [Nov 6, 2013]
    Yes it's brown is this a bum part ?
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  9. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Nov 6, 2013]
    'J' valve... not 'tuned' at all... J valve is from an Audi S2... little bit lazier in reaction and promotes a boost spike... ME7 ecu's like yours don't like them much as std and on generic maps but custom mapping get normally alleviate the spike...

    Spiky boost is not a good thing... can bend rods... J valves tend to put ME7 based cars into limp mode if caught unawares..

    Like I said, no such thing as tuned, just different...

    <tuffty/>
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  10. jay22s3
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    jay22s3 2nd gear sorts em out

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    [Nov 6, 2013]
    My car has a custom map , so should this happen ? Should I take the j valve off ? Or what ?
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