Special tools required:

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

32 2 110

Necessary preliminary tasks:

Read out fault memory of DME control unit. Refer to ON-BOARD DIAGNOSTICS .
Check stored fault messages
Switch off ignition

Unlock hose (1) and detach.

Unlock plug (2) and remove.

Fig 1: Removing Hose & Plug

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Once it has been removed, oil drips from the solenoid valve.

Have a cleaning cloth ready.

Make sure no oil drips onto the belt drive. Remove any remnants of oil immediately with cleaning cloth.

Do not damage oil line when releasing solenoid valve.

Release solenoid valve with special tool 32 2 110.

Installation:

Tightening torque. Refer to ENGINE - TIGHTENING TORQUES .

Now clear the fault memory.

Fig 2: Releasing Solenoid Valve With Special Tool 32 2 110

Courtesy of BMW OF NORTH AMERICA, INC.