Water Pump, Rein - 135i/335i/535i, X3/X4/X5/X6/Z4 35i (N54, N55)

The water pump used in the 2007-2015 N54 and N55 turbo 6-cylinder cars is electric and plays a vital role in managing temperatures for multiple systems throughout the car. However, because it's electric, when it fails it does so completely and without warning. We strongly recommend replacing the water pump before 80,000 miles.

BMW changed to an electric pump to reduce emissions and make the engine more efficient. Pumps driven from the engine accessories used up fuel which made for more emissions. Electric pumps only work when they are needed and only require the alternator to supply power. Because the engine computer regulates engine temperatures, the water pump only needs to work when it has to (including after the car has been turned off). In theory this should make the pump last longer. But it's the electronics inside that fail and will force a replacement, often without warning. Although if you are religious about oil changes and checking/clearing fault codes you may get a soft (hidden) code for low water pump output ahead of time.

The three (3) mounting bolts for the pump are required. In an effort to reduce weight BMW uses a very light weight bolt that can only be used once. See BMW part #11517602123 for replacement bolts.

This part is manufactured by Rein (CRP) Automotive - an original supplier to BMW for many various BMW parts. As an OEM Rein strives to meet all of BMW's original design, fitment, and performance requirements. OEM-type parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.

BMW Fitments:

1 Series
E82 / E88 (08-13) > 135i
E82 / E88 (08-13) > 135is
E82 / E88 (08-13) > 1M (11-12)
3 Series
E90 / E91 / E92 / E93 (06-13) > 335i
E90 / E91 / E92 / E93 (06-13) > 335is
E90 / E91 / E92 / E93 (06-13) > 335xi
5 Series
E60 / E61 (04-10) > 535i
E60 / E61 (04-10) > 535xi
5 Series
F10 / F11 (11-16) > 535i
F10 / F11 (11-16) > 535i xDrive
6 Series
F12 / F13 (12-18) > 640i
7 Series
F01 / F02 (2009-2015) > 740Li
F01 / F02 (2009-2015) > 740i
X1 Series
E84 X1 (2013-2015) > X1 35i xDrive
X3 Series
F25 X3 (2011-2017) > X3 xDrive35i
X4 Series
F26 X4 (2015-2018) > X4 35i xDrive
F26 X4 (2015-2018) > X4 M40i xDrive
X5 Series
E70 X5 (07-13) > X5 xDrive35i
X6 Series
E71 X6 (2008-2014) > X6 xDrive35i
Z Series
E89 Z4 (2009-2016) > Z4 sDrive35i
E89 Z4 (2009-2016) > Z4 sDrive35is