Excessive valve and bore clearance due to wear.
The Sonnax oversized valve corrects valve-to-bore clearances and also prevents future wear in this area.
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.
Contact a Sonnax Parts Distributor.
Inspection indicates visible bore wear or a vacuum test performed at locations indicated below yields less than 19" of vacuum.