Secondary Air Pump - E39 540i, M5 1999-2003

This part is listed by BMW as BMW part number 11721433958 (11-72-1-433-958) and is described as Secondary Air Pump - E39 540i and E39 M5 (1999, 2000, 2001, 2002, 2003) 

The secondary air pump is a source of many headaches on the E39 5 Series V8 models. When the pump fails, it will surely result in a check engine light and a failed emissions / smog check. Fortunately a new air pump can cure the issue and get your E39 back in compliance. 

This secondary air pump (sometimes referred to as SAI pump or auxiliary pump) is made by an Original Equipment Manufacturer (OEM) to BMW, so you can be assured it's the highest quality. 

For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.