In listed VW/Audi units, the boost regulator valve, which regulates EPC pressure feed to the main regulator valve, is secured in the valve body with a ratcheting end plug. Attempting to turn the end plug in order to tune line pressure will cause the end plug to break. Additionally, the boost regulator valve can cause significant wear to the bore, allowing EPC leakage, which can result in low line pressure, soft shifts and burned clutches. This bore should be inspected for wear on every rebuild.

The worn bore may be salvaged using the Sonnax oversized boost regulator valve 119940-05K for 01M, 01N or 01P units. Sonnax ratcheting end plug 119940-22 and adjustment tool [119940-TL9] allows line pressure to be fine-tuned.

• High-quality plastic ratcheting end plug is designed to replace broken or missing OE end plugs
• Adjustment tool allows line pressure to be tuned without breaking the end plug by compressing the ratcheting arms of the OE or Sonnax end plug
• Drop-in Zip Valve™ part installs quickly and easily