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Sudden loss of boost

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by AudiA4rulz, Dec 6, 2004.

  1. AudiA4rulz
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    AudiA4rulz New Member

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    [Dec 6, 2004]
    My 2002 A4 1.8T doesn´t boost like it used to. I have an APR chip and a hyperboost valve. I don´t hear the turbo whistle as before when I step on the gas pedal. What could it be? thanks
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  3. FCastle25
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    FCastle25 New Member

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    [Dec 13, 2004]
    You may need a new Turbo Diverter Valve. When this component fails, it causes boost issues.
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