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The Gates emission control hose for 2004-2005 BMW 645Ci V8 4.4L connects the left-side valve cover to the intake to route crankcase vapors and maintain ventilation. It replaces damaged or hardened left-side breather lines that can cause vacuum leaks or oil contamination. Installing the correct left-side replacement restores sealing and helps prevent emissions faults and oil leaks.
Gates 04-05 BMW 645CI V-8 4.4L Valve Cover To Intake (Left Side) Emission Control Hose