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.

11 6 420

Necessary preliminary tasks:

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

E85 only:

Remove fluid tank for windshield washer system

Unlock plug (1) and remove.

Cut through cable tie (2).

Fig 1: Removing 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.

Release solenoid valve with special tool 11 6 420.

Installation:

Tightening torque. Refer to ENGINE - TIGHTENING TORQUES .

Now clear the fault memory.

Fig 2: Releasing Solenoid Valve With Special Tool 11 6 420

Courtesy of BMW OF NORTH AMERICA, INC.