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  • High line pressure in Reverse
  • Erratic line pressure
  • No line rise
  • Delayed engagement
  • Engine stall at idle


Wear at the boost regulator bore can cause low line pressure.


Repair boost regulator valve bore for improved boost oil control.

01M, 01N, 01P

Oversized Boost Regulator Valve Kit
Part No. 119940-05K

You need this if... View Instructions

Wear at the inboard end of the boost regulator bore in VW/Audi 01M, 01N and 01P units can reduce the ability of EPC/TV pressure to stroke this valve open. Full boost exiting this valve combines forces with the main regulator spring, increasing line pressure. Sonnax oversized boost regulator valve kit 119940-05K allows the valve bores to be refurbished.

  • Oversized hard-coat anodized aluminum valves restore hydraulic integrity of the circuits andprevent wear
  • A replacement ratcheting end plug is included, as the OE one often breaks
  • An adjustment tool is provided for repeated assembly, disassembly and adjustment of the ratcheting end plug
  • Valve
  • Ratcheting End Plug
  • 119940 05k combo
  • 119940 05k

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

  • 119940 05k in test