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The Gates emission control hose for 1999-2004 Volkswagen Jetta 4-cyl 1.9L diesel connects the PCV valve to the emissions plumbing to maintain proper crankcase ventilation. It replaces degraded PCV lines that can lead to vacuum leaks or oil-soaked intake passages. Swapping the hose restores sealing in the ventilation circuit and helps reduce smoke, odors, and check-engine codes related to leaks.
Gates 99-04 Volkswagen Jetta 4-Cyl. 1.9L Diesel PCV Valve Hose Emission Control Hose