Rattling sound coming from under the engine

Hey Joel, this is Bo, an auto expert on RepairPal's Car Genius team! If your GTI is still rattling after replacing the flywheel, it might be worth checking the heat shields for looseness or damage, as they can often cause rattling sounds. Also, inspect the exhaust system for any loose components or hangers, and consider the engine mounts, as worn mounts can lead to rattling. Another possibility is the timing chain or tensioner; if these are worn, they can produce rattling noises. A professional inspection might be necessary if these checks don't resolve the issue. Good luck! If you have any other questions, please call us at 877-913-1554! We'll gladly find you a certified RepairPal shop in your area!