Vacuum Unit - Switchover Valve, Remove and Install (X 18 XE1)
Remove, Disconnect
Remove engine control unit - see operation "Engine Control Unit, Remove and Install (X 18 XE1)".
Unclip actuation rod (1) from switchover valve ball head.
Detach vacuum hose (2).
Remove fastening bolts (arrows) and remove switchover valve vacuum unit.
Install, Connect
Attach switchover valve vacuum unit to inlet manifold.
Attach vacuum hose to vacuum unit.
Clip actuation rod into ball head.
Install engine control unit - see operation "Engine Control Unit, Remove and Install (X 18 XE1)".
Remove, Disconnect 
Install, Connect 