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Sudden loss of boost

AudiA4rulz Dec 6, 2004

  1. AudiA4rulz

    AudiA4rulz New Member

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    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
     
  2. FCastle25

    FCastle25 New Member

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    You may need a new Turbo Diverter Valve. When this component fails, it causes boost issues.
     

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