00 00... Checking water drain under brake booster for contamination, cleaning if necessary

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.

Remove microfilter housing (1) and air duct (2).

Fig 1: Removing Microfilter Housing & Air Duct

Courtesy of BMW OF NORTH AMERICA, INC.

Check water drain channel (1) under brake booster for contamination, clean if necessary.

Fig 2: Identifying Water Drain Channel

Courtesy of BMW OF NORTH AMERICA, INC.