The Gates emission control hose for 1998–2004 Volvo V70 5‑cyl 2.4L connects the oil separator to the engine (upper) as part of the emissions control plumbing. It replaces the factory separator-to-engine hose, keeping the intended routing between the oil-separating assembly and engine inlet to maintain the vehicle's designed emissions and crankcase flow connections.

Gates 98-04 Volvo V70 5-Cyl. 2.4L Oil Separator To Engine (Upper) Emission Control Hose