Improper VANOS function will cause reduced power and poor fuel economy. The VANOS system is BMWs version of variable valve timing and can be found on the intake and or exhaust camshafts. The system uses a pair of electrically actuated solenoids that direct the flow of pressurized oil to the VANOS gears. Depending on engine requirements the VANOS system can advance or retard timing as requested by the ECU.
The VANOS system in your BMW is a sophisticated piece of engineering. By using oil pressure to adjust camshaft profiles, it delivers greater torque at lower RPMs and higher power at higher RPMs. This hose should be replaced during any VANOS service, as its position can cause a leak after extensive high-temperature, high-pressure use. If the pressure hose is leaking, the VANOS components may not receive adequate lubrication, leading to potential failure, and you will also notice a significant oil leak. Replace your leaking hose now to prevent costly repairs in the future.
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