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  1. VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum
    Hi all, Fault code came up "17964/P1556 Turbo/super charger boost sensor (A) circuit: control limit not reached" on my mates generic (non-VW) code scanner; my garages scanner didn't come up with any codes when I had it in. I think I've narrowed it down to being a leak, probably from the vacuum...
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