Audi , A6 , C5 , 3.0 (2001-) Common Issues

Most Common Issues:

1. Oil leaks from valve cover gasket (90% of cases)
2. Transmission problems (70-80%)
   • Solenoid pack failure
   • Gearbox linkage issues
3. Coolant leaks (60-70%)
4. Faulty oxygen sensor (50-60%)
5. Rear main seal oil leak (40-50%)

Moderately Common Issues:

1. Fuel pump replacement (30-40%)
2. Air mass flow sensor problems (20-30%)
3. Ignition coil failure (20-30%)
4. Starter motor issues (20-30%)
5. ABS malfunction (15-25%)

Less Common Issues:

1. Turbocharger failure (10-20%)
   • Wastegate or turbine blade damage
2. Fuel pressure regulator problems (10-20%)
3. Power steering pump failure (5-15%)
4. Rear axle bearing wear (5-15%)
5. Electronic throttle body issues (5-15%)

Rare Issues:

1. Engine oil filter housing gasket leak (less than 5%)
2. PCV system vacuum leaks (less than 5%)
3. Fuel injector problems (less than 5%)
4. Catalytic converter failure (less than 5%)
5. Rear wheel bearing failure (less than 5%)