In VW/Audi 01M, 01N and 01P transmissions, regulated line leaks to exhaust at the pressure regulator creates a low pressure condition. Wear at the inner balance spools prevent the valves from stroking, which can cause high line pressure. Wear at the inboard bore also affects the K1 clutch circuit, which can result in 1-2 or 2-3 shift complaints. Reconditioning the bore and installing Sonnax oversized main pressure regulator valve kit 119940-03K restores hydraulic integrity.

Hardcoat anodized aluminum valve combats premature wear
Contains an O-ringed end plug to positively seal the bore and prevent regulated boost line pressure from exhausting
A new spring is included to work with the oversized valve and re-establish OE regulated pressure specifications

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