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Audi , A6 , C5 , S6 Quattro (1999-) Common Issues

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  1. Coolant leaks due to faulty radiator hoses (24% of total issues)
  2. Timing chain tensioner failure (16%)
  3. Rear main seal oil leak (12%)
  4. Ignition coil pack failure (10%)
  5. Low-pressure fuel pump failure (9%)
  6. Transmission solenoid valve failure (8%)
  7. Air mass meter failure (7%)
  8. Oxygen sensor failure (6%)
  9. Fuel pressure regulator failure (5%)
  10. Idle control valve failure (4%)
  11. Rear axle seal oil leak (3%)
  12. EGR system vacuum leak (2%)
  13. Spark plug wire deterioration (1.5%)
  14. Fuel injector clogging (1%)
  15. Brake master cylinder failure (0.8%)
  16. Power steering pump leakage (0.6%)
  17. Turbocharger wastegate actuator failure (0.4%)
  18. Rear differential bearing failure (0.3%)
  19. Crankshaft position sensor failure (0.2%)
  20. Engine oil pressure sensor failure (0.1%)
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