What makes my 2nd Gen. prius, knock and rattle but still runs

Hello, the words "knock" and "rattle" are not good for any engine! Have a technician at a shop near you listen to your noises. They can easily determine if it's evidence of a catastrophic internal engine concern or something different that can be resolved. Have it checked soon before a more catastrophic concern occurs. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.