Original BMW Valve Cover PCV Diaphragm Repair Kit for First-Generation B58 BMW M240i, 340i, 440i, 540i, 640i GT, 740i, X3 M40i, and X4 M40i (2016–2024)

First-generation B58 engines carry their PCV valve inside the valve cover, and the Original BMW crankcase vent valve 11-12-1-025-447 is the repair kit that renews its diaphragm on the 340i, 440i, 540i, 740i, M240i, X3 M40i, and X4 M40i. The PCV valve controls crankcase vacuum, and on the gen 1 B58 its diaphragm can tear, pulling crankcase vacuum too high. BMW describes this repair in Service Information Bulletin SIB 01 14 23. The kit replaces the diaphragm without replacing the valve cover, which saves a significant amount of time and cost on the job. BMW names it the crankcase vent valve, and it is also sold as a PCV valve repair kit.

Original BMW Parts carry a 24-month parts warranty.

A torn diaphragm has a clear pattern. Expect puffs of blue or white smoke from the exhaust on a cold start, and you may hear a whistling noise while driving. The failure commonly sets a permanent cylinder 6 misfire and fuel injector cutoff, fault codes 140601 and 140610. Measured crankcase vacuum gives another clue: about -100 mbar instead of roughly -50 mbar indicates the pressure control valve in the cylinder head cover is faulty.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-12-1-025-447
• BMW part name: crankcase vent valve
• Type: PCV valve diaphragm repair kit for the valve cover
• Engine: first-generation B58
• Service reference: BMW SIB 01 14 23
• Sold as: one repair kit
• Warranty: 24-month parts warranty

Common Questions

Do I have to replace the whole valve cover to fix the PCV valve?
No. This kit replaces only the diaphragm, unless the cover is also leaking oil around its edge.

Which fault codes point to this failure?
Code 140601 for a permanent cylinder 6 misfire and 140610 for fuel injector cutoff are common with a torn diaphragm.

Talk to PMB Performance about the right PCV parts for your B58.

Fitment & Compatibility

Compare your production year and trim against the table below. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.