Genuine OEM Volkswagen Camshaft Adjuster Unit, part number 022109087E. This component is part of the engine's variable valve timing system, responsible for adjusting the camshaft's position to optimize engine performance, fuel efficiency, and emissions across different operating conditions. It works by controlling oil pressure to alter the camshaft timing. As a genuine OEM part, it ensures precise and reliable operation of the valvetrain. Genuine OEM camshaft adjusters are manufactured to strict tolerances for accurate timing control.