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  1. A3 2.0 TDI 140 Turbo underboost issue

    Mk5 VW Jetta, Sportwagen, and Audi A3 TDI forum
    Hi, my 2006 A3 2.0 TDI 140 turbo won't boost - unless I remove the pipe that comes out of the vacuum reservoir - in which case it boosts well. I've spoken to local garages, several Audi technicians and turbo specialists and no one has been able to provide an answer as to why it will only boost...