How do you tell if the bottom end has gone in an Audi?

To determine if the bottom end of an Audi engine has failed, listen for knocking or tapping noises from the engine, especially during acceleration. Check for excessive oil consumption or leaks, which can indicate worn bearings. Additionally, perform an oil pressure test; low pressure can signify bearing wear or damage. Finally, inspect for metal shavings in the oil, as this can indicate significant internal damage.