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What initially appeared to be a major tiptronic gearbox fault on my B6 S4 Avant turned out to be a result of a sticky brake light switch, sending a faulty signal to the torque converter and preventing auto up-shifts. Replacement switch fixed it. Problem is, it took the replacement of the gearbox val...

Just had coil packs replaced on my B6 S4 Avant Tiptronic free of charge, while in for routine service. It came up on their system as a recall item.