This part is listed by BMW as BMW part number 11157623745 (11 15 7 623 745) and is described as the vent outlet hose from the valve cover to the turbocharger duct on B46 engines used in F22 / G42 230i, F30 / G20 330i, F32 / G22 430i, G30 530i, G01 X3 30i, G02 X4 30i, and G29 Z4 30i. This covers both B46A and B46D engines. This hose has an electrical connection for a small heater circuit that prevents the oil vapor and droplets from turning into a sludge in cold climates (aka Blow-by Heater).
The crankcase vent system is responsible for separating oil from the air inside the engine and air intake. Liquid oil is returned to the oil pan while oil vapors are sent to the intake (via the turbo) to be burned up during the combustion cycle. It's also known as a a PCV, CCV, and oil separator system. Too much oil in the intake air lowers the effective fuel octane, leads to drivability issues, and causes increased emissions. A completely blocked CCV has the potential for very serious engine failure (hydrolock) if liquid oil ends up in the turbo or intake. Signs of a failing CCV include: whistling noises in the intake, blueish smoke in the exhaust, high oil consumption, and thick white or yellow gunk under the oil cap.
This is a B46 vent hose manufactured by Rein Automotive (CRP) - a front-line supplier of original equipment, private label, and in-house engineered replacement parts. Rein replacement products meet or exceed all of BMW's original design, fitment, and performance requirements and they carry out testing with ISO and German TUV for quality control. Rein 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.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
BMW Fitments:
2 Series
F22 / F23 (2014-2021) > 230i
F22 / F23 (2014-2021) > 230i xDrive
2 Series
G42 / G43 (2022+) > 230i
G42 / G43 (2022+) > 230i xDrive
3 Series
F30 / F31 / F34 (2012-2019) > 330i
F30 / F31 / F34 (2012-2019) > 330i xDrive
3 Series
G20 (2019+) > 330e
G20 (2019+) > 330e xDrive
G20 (2019+) > 330i B46D (2019-2024)
G20 (2019+) > 330i xDrive B46D (2019-2024)
4 Series
F32 / F33 / F36 (14-20) > 430i
F32 / F33 / F36 (14-20) > 430i xDrive
4 Series
G22 / G23 (2021+) > 430i B46D (2021-2024)
G22 / G23 (2021+) > 430i xDrive B46D (2021-2024)
5 Series
G30 (2017-2023) > 530i B46A (2017-2019)
G30 (2017-2023) > 530i B46D (2020-2023)
G30 (2017-2023) > 530i xDrive B46A (2017-2019)
G30 (2017-2023) > 530i xDrive B46D (2020-2023)
X3 Series
G01 X3 (2018-2024) > X3 sDrive30i (2018-2019)
G01 X3 (2018-2024) > X3 sDrive30i (2020-2024)
G01 X3 (2018-2024) > X3 xDrive30i (2018-2019)
G01 X3 (2018-2024) > X3 xDrive30i (2020-2024)
X4 Series
G02 X4 (2019-2025) > X4 xDrive30i (2018-2019)
G02 X4 (2019-2025) > X4 xDrive30i (2020-2025)
Z Series
G29 Z4 (2019-2025) > Z4 sDrive30i