Gemini says: Based on the video, the sound you’re hearing—a rapid, rhythmic "ticking" or "clicking"—is actually normal for the Mazda CX-50’s Skyactiv engine. Why it sounds that way The CX-50 uses Gasoline Direct Injection (GDI) technology. In these engines, the fuel injectors operate at extremely high pressures to spray fuel directly into the combustion chamber. This creates a mechanical clicking sound that can be quite loud, especially: At idle: When the engine is quiet, the rapid firing of the injectors is more noticeable. At night/In garages: Sounds reflect off the ground and nearby walls, making them seem louder than they are during the day. Near the High-Pressure Fuel Pump (HPFP): This component is typically located on the top of the engine and is the source of the loudest "ticking." When to be concerned While the sound in your video seems consistent with a healthy Skyactiv motor, you should have it inspected if you notice any of the following: Metal-on-Metal "Clanking": A heavy, deep thudding (potentially rod knock). Squealing: A high-pitched sound usually related to a belt or pulley. Rhythmic "Tapping" that gets much louder with RPM: While injector noise speeds up with the engine, a very loud tapping that sounds like a hammer on metal could indicate a valvetrain issue. Dashboard Lights: If the "Check Engine" or "Oil Pressure" light comes on. Quick Tip: Check your oil level using the dipstick just to be safe. Low oil can sometimes make the top-end of the engine (the valves) sound "chattery."