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00 00... Steering fluid reservoir: Check oil level

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.
Using contaminated equipment to add fluid may introduce dirt particles into the fluid reservoir and significantly reduce the service life of the power steering system. Do not use any filler funnels or similar!

Visual inspection and leak test 

Check connections, hoses and steering gear for traces of fluid.

Checking fluid level 

Check fluid level with engine switched off at expansion tank of power steering/ride-height control system. The fluid temperature should be approx. 20°C here.

Ensure that the cap is fully screwed in prior to the fill level check.

If necessary, add hydraulic fluid up to Max. marking (1).

IMPORTANT: If the fluid level has dropped to the Min. marking (2), you must check the power steering and ride-height control for leaks and issue a separate invoice for this work.

It is not enough merely to top up the fluid. 

Fig 1: Identifying Power Steering Fluid Max And Min Marking
G04725317Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: To avoid mix-ups when filling with hydraulic fluid, mark the fluid reservoirs or their caps with identification marks.

ATF Automatic transmission fluid

CHF Pentosin CHF11S

Fig 2: Identifying ATF Automatic Transmission Fluid And CHF Pentosin CHF11S
G04725318Courtesy of BMW OF NORTH AMERICA, INC.