Dorman - OE Solutions PCV Valve Diaphragm P/N:911-115

Keep crankcase pressure in check and route blow-by vapors along their intended path with the Dorman - OE Solutions PCV Valve Diaphragm 911-115. It drops in as a direct-fit replacement for a wide range of 2012-2017 BMW models — including the 320I, 328I, 528I, X1, X3 and Z4 — with the full list of 22 applications on the Buyer's Guide tab.

As part of the positive crankcase ventilation (PCV) system, this diaphragm helps regulate the flow of blow-by gases from the crankcase toward the intake using engine vacuum, so crankcase pressure stays within the intended range. The flexible diaphragm can tear or stiffen with age and heat, and that is typically when replacement is needed.

• Regulates crankcase ventilation: meters the flow of blow-by vapors from the crankcase to the intake and helps relieve crankcase pressure.
• Direct-fit replacement: designed to replace the original diaphragm on the listed BMW applications.
• Signs it may need replacing: a torn or hardened diaphragm can show up as a rough idle, a whistling or hissing vacuum-leak noise, or oil seepage. If a failed diaphragm is the cause, this part replaces it — diagnose the source first, since these symptoms can have other causes.

Manufacturer part number 911-115 (also 911115).