One problem related to engine turbo-charger has been reported for the 2001 Audi S4. The most recently reported issues are listed below.
Chronic problem with blown turbos. Audi has made engineering changes to the tubros without notifiying customers of impending failures. They are also voiding customer warranties blaming failures on aftermaket equipment without verifying the aftermarket equipment indeed caused the failure. I am conceerned that I have known defective parts in my vehicle that may fail at any time.
| Engine Cooling System problems | |
| Radiator problems | |
| Coolant Leaking problems | |
| Engine And Engine Cooling problems | |
| Engine Exhaust System problems | |
| Engine Turbo-charger problems |