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ESP Light...

Discussion in 'A4/S4 forum(B5 Chassis)' started by newtoS4, Apr 30, 2007.

  1. newtoS4
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    newtoS4 New Member

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    [Apr 30, 2007]
    Okay here I am again.

    In my 2000 S4 Avant.

    Having got wheel bearing sorted and run VAG COM I can not see why my ESP light comes on under hard acceleration.
    Usually in third around 5000rpm but it can happen in 2nd lower down.

    I have used VAG COM to record wheel speeds and other ABS/ESP sensors all are fine and no fault codes anywhere else.

    A quick run recording engine values also looked okay.
    Boost pressure maximun at 1750 ish from a 1010 tickover.
    MAF peaked at 204 under load 5-6 at tickover.
    Labdas both peaking at 8-10%

    Any advice on what I could log and what the values should be to check MAF, etc. Have had a quick go but not sure how to verify that the answers/graphs are good.

    Car still pulls well. Is it a good idea to try a FATS test with the ESP off?
    At least I can be confident in the engine then.


    It looks like I need a trip to a specialist.

    Can any one recommend the easiest to get to from Weymouth?

    Thanks in advance.
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  3. shineydave
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    shineydave Member

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    [Apr 30, 2007]
    boost looks a little low, should be peaking at 0.8 bar (800mb. the figure your seeing at 1750mb includes 1010mb atmospheric pressure so you subtract that) i'd also suggest the MAF is undereading, max at 204g/s suggests a max bhp of 255 which is also a little on the low side.

    is the ABS warning light coming on too?. i've had a MAF failure which put both the ABS and ESP lights on
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  4. newtoS4
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    newtoS4 New Member

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    [May 2, 2007]
    This time I ran WOT through 2nd and 3rd
    1790 and 1820 mbars
    With MAF 228.3
    This sounds better then. Is it?

    Some chaps on rs246 reckon it might be tyres so will go there next.
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  5. shineydave
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    shineydave Member

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    [May 2, 2007]
    yup that lot sounds better, i'm following the thread on RS246 too, that's the best place for advice on S4's
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