15845-RAA-A01 Vtc Filter Assembly - Overview. The 15845-RAA-A01 Vtc Filter Assembly is an essential component designed specifically for the Honda VTC (Variable Timing Control) system. This filter assembly supports the oil filtration system within the VTC to ensure clean oil circulation, which is critical for smooth and efficient operation of Honda marine and automotive engine systems. Engineered to maintain peak performance and reliability, this filter assembly ensures seamless integration with