how important is fixing the vtc solenoid ring

Hello, The VTC system (VTEC) on your vehicle should be maintained to ensure proper engine performance and fuel mileage. This solenoid uses oil pressure to request changes in the valve timing as needed, so a leak can cause this function to fail. You could still drive the vehicle if you never fixed it, but your engine performance and fuel mileage will be altered negatively. Also, the engine control module expects valve timing to change, and when it does not, it will cause your check engine light to display. If you doubt the technician, always get a second opinion.