Transmissions with a ZF5HP19 can experience erratic line pressure, poor shift quality, Reverse complaints and B clutch breakage due to excess wear in the main pressure regulator valve bore. After reconditioning the bore, installing Sonnax oversized pressure regulator valve 85755-01 will restore hydraulic integrity for proper line pressure control in all ranges.
There are two types of ZF5HP19 valve bodies. Version 1, the E17, has a valve with four spools on it, and the speed sensor is mounted on the valve body. Version 1 is used in Audi & VW units only. Version 2, the E18.2, has a valve with five spools on it, and the speed sensor is mounted on the transmission case. Version 2 is used in Audi, VW & BMW units.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.