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overboost

  1. Underboost...now overboost

    VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum
    I have a Passat with the AWX 130 PD engine. Has been going into limp mode for a while now and had been showing fault code for underboost. It got a new tandem pump, new N75 valve, reconditioned turbo (at which point the EGR was deleted). None of this made any difference and was still showing...
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