OEM Timing Chain Tensioner 06E109507H, 06E109507F, 06E109507AK For A4 B8, A5, A6 C7, A8L D4, Q5, Q7 10-15, 10-18 This timing chain tensioner is designed to maintain proper tension on the engine's timing chain, accurate valve timing and smooth engine.It is compatible with specified vehicle models and engine types from model years 2010 to 2018.The unit fits specifications and supports performance under normal operating conditions.It is intended for use in engines requiring part numbers 06E109507H, 06E109507F, or 06E109507AK.Installation requires standard mechanical tools and knowledge of engine systems.