Pressure converter for the turbo, aka N75.

This device can and does fail, causing the turbo to appear to be completely dead.

For all A4 chassis TDIs with ALH engine except early 98 New Beetle/99.5 Jetta/Golf, which use the 1H0 version of this part. Check to see if you have a D-shaped connector or a square one (this part uses the D-shaped connector, the 1H0 is square).

This valve will work with PD engined TDIs with engine code BEW, and does work on the B5.5 Passat.