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...