This VVT solenoid is designed to regulate oil pressure within the variable valve timing system. By precisely controlling oil flow to the camshaft phasers, it allows for adjustments to valve timing based on engine speed and load. Proper functioning of the VVT system is crucial for maximizing engine power, improving fuel economy, and reducing emissions. A faulty solenoid can lead to rough idling, poor acceleration, increased fuel consumption, and illuminated check engine lights. Manufactured by TOPRAN, this VVT solenoid (part code 639 165) is built to meet or exceed original equipment specifications, providing a reliable solution for restoring your vehicle's VVT system performance.