Wow, that sound BAD! The first place I’d look is an 1) idler pulley or 2) an alternator bearing, 3) water pump or maybe 4) a power steering pump… It sounds like it is about ready to grenade! I think that is the ringing-rattle you hear. If there is power steering fluid or coolant spraying about THAT’s a hint!
So why is the check engine light on? Have you pulled the OBD codes? What Are they? That’s the first thing to do.
Next, remove the serpentine belt and turn all the pulleys, except the one on the crankshaft, of course, and feel the pulleys for roughness. If it isn’t obvious, start the engine, only for less than a minute since the water pump isn’t turning - Is the rattle still there?
If so, uh-oh, that’s likely the timing chain tensioners failing. That’s a big job. The entire front of the engine needs to be torn down to replace all the parts.
Post back with the OBD 2 codes, please.