Continuous oscillation of the pressure regulator valve in Hyundai/Kia A4CF1, A4CF2 transmissions cause valve body bore wear, resulting in line pressure irregularities and valve instability. Sonnax oversized pressure regulator valve kit 84741-03K fixes these issues by combining a sleeved balance spool to eliminate the wear preventing proper valve stroke, and a modified pressure regulator valve with lengthened spools to increase sealing contact and provide greater stability.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected. If poor vacuum results are discovered at the OE pressure regulator valve, Sonnax PR valve kit [84741-01K] should be installed.