Genuine OEM Volkswagen Camshaft, part number 06E109101BC. This component is responsible for the precise opening and closing of engine valves to regulate air and fuel intake and exhaust gas discharge. It is a precision-machined rotating shaft located within the cylinder head assembly. Genuine OEM camshafts are manufactured to exact lobe profiles and surface hardness specifications to ensure correct valve timing and prevent premature wear of the valvetrain.