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Engine Variable Valve Timing Solenoid (2VTS0488) by Holstein®. Global coverage of European, Asian, and Domestic vehicles. OE Replacement Parts You Can Trust. The Variable Valve Timing Solenoid alters the supply of oil pressure to the camshaft depending on the speed and load of the engine and can either advance or retard cam position which provides several benefits, including improved engine operation, increased engine power reduced fuel consumption and decreased emissions.