The B58A turbocharged engine uses a spring-loaded rubber diaphragm to control crankcase pressure. Over time, this component wears and begins to leak oily vapor past the seal. There are tell-tale signs of oil leaking around this plastic cap and the unpleasant burning oil smell. This set of original BMW parts will allow you to restore proper operation of the PCV system.
This part is listed by BMW as BMW part number 11121025447 (11-12-1-025-447) and is described as Genuine BMW PCV Repair Kit for B58A Engine on F22/F23 M240i (2016, 2017, 2018, 2019, 2020, 2021), F30/F34 340i (2016, 2017, 2018), F32/F33/F36 440i (2016, 2017, 2018, 2019, 2020), G30 540i (2017, 2018, 2019), G11/G12 740i (2016, 2017, 2018, 2019), G01 X3 M40i (2018, 2019), and G02 X4 M40i (2019).
Only for B58A engine. On G30 5-series, G11/G12 7-Series, G01 X3, and G02 X4 models, this is only for 2019 models and older.
This is a Genuine BMW B58 crankcase vent cap with a two year warranty. Buying a Genuine part will usually be more expensive than an OEM or aftermarket brand but you are assured that it meets BMW's designs for fitment, performance, and longevity. It will also be the very latest design, incorporating any updates or revisions that an aftermarket brand typically will ignore.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
