Fits selected 1.4 TDI, 1.9 TDI, 2.0 TDI and 2.5 TDI engines, including many VW Golf, Jetta, Passat, Transporter T5, Crafter, Audi A3, A4, TT, Seat, Skoda and Porsche applications. Controls turbocharger vacuum / boost pressure and may help solve limp mode, poor acceleration, overboost, underboost or turbo actuator control faults. This valve converts ECU electrical control signals into proportional vacuum pressure to operate the turbocharger actuator, wastegate or variable geometry turbo system. A faulty pressure converter can cause incorrect turbocharger control and poor engine performance. Replacing the valve may help solve: Please compare the part number, connector shape and vacuum port layout with your old valve before ordering. Similar turbo pressure converters may look alike but are no