BMW Vent Hose - Rein 11127599753

Product Information

This aftermarket crankcase breather hose replaces the original BMW part and is essential to the proper function of your engine's PCV (Positive Crankcase Ventilation) system.

Also referred to as a crankcase oil separator or ventilation valve, the breather hose directs crankcase gases toward the PCV system, where oil mist is separated and returned to the engine, and the filtered gases are reintroduced to the intake for combustion. This helps reduce emissions and maintain clean engine operation.

Over time, the breather hose can degrade due to constant exposure to oil vapor, pressure, and heat. Regular inspection and replacement prevent potential air leaks and performance issues.

Common failure symptoms:

• Cracks, breaks, or leaks from heat and oil vapor exposure
• Brittle or broken plastic connectors
• Visible holes or splits in the hose
• Check engine light triggered by air intake leaks
• Misfires or rough engine operation
• Oil residue or burnt oil odor near the hose or valve cover

This is a cost-effective replacement to restore optimal crankcase ventilation and ensure emissions compliance.