In VW/Audi 01M, 01N and 01P units, regulated line leaks to exhaust at the pressure regulator, it 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. Sonnax oversized main pressure regulator valve 119940-03K allows the valve bores to be refurbished.

• Oversized hard-coat anodized aluminum valves restore hydraulic integrity of the circuits and prevent 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